diff --git a/greenmine/base/admin.py b/greenmine/base/admin.py
new file mode 100644
index 00000000..ba63c907
--- /dev/null
+++ b/greenmine/base/admin.py
@@ -0,0 +1,9 @@
+from django.contrib import admin
+from .models import Site
+
+
+class SiteAdmin(admin.ModelAdmin):
+    list_display = ('domain', 'name')
+    search_fields = ('domain', 'name')
+
+admin.site.register(Site, SiteAdmin)
diff --git a/greenmine/base/apiviews.py b/greenmine/base/apiviews.py
new file mode 100644
index 00000000..fd071765
--- /dev/null
+++ b/greenmine/base/apiviews.py
@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+
+from rest_framework import viewsets
+from rest_framework.response import Response
+
+
+class SiteViewSet(viewsets.ViewSet):
+    def status(self, request, **kwargs):
+        return Response({})
+
+
+sitestatus = SiteViewSet.as_view({"head": "status", "get": "status"})
diff --git a/greenmine/base/auth/api.py b/greenmine/base/auth/api.py
index cbeafd83..c10719df 100644
--- a/greenmine/base/auth/api.py
+++ b/greenmine/base/auth/api.py
@@ -2,21 +2,135 @@
 
 from django.db.models.loading import get_model
 from django.contrib.auth import logout, login, authenticate
+from django.shortcuts import get_object_or_404
 
 from rest_framework.response import Response
 from rest_framework.permissions import AllowAny
 from rest_framework import status, viewsets
+from rest_framework.decorators import list_route
 
+from greenmine.base.models import SiteMember
+from greenmine.base.sites import get_active_site
+from greenmine.base.users.models import User, Role
+from greenmine.base.users.serializers import UserSerializer
 from greenmine.base import exceptions as exc
 from greenmine.base import auth
 
-from greenmine.base.users.models import User, Role
-from greenmine.base.users.serializers import UserSerializer
+from .serializers import (PublicRegisterSerializer,
+                          PrivateRegisterSerializer,
+                          PrivateGenericRegisterSerializer,
+                          PrivateRegisterExistingSerializer)
 
 
 class AuthViewSet(viewsets.ViewSet):
     permission_classes = (AllowAny,)
 
+    def _create_response(self, user):
+        serializer = UserSerializer(user)
+        response_data = serializer.data
+        response_data["auth_token"] = auth.get_token_for_user(user)
+        return response_data
+
+    def _create_site_member(self, user):
+        site = get_active_site()
+
+        if SiteMember.objects.filter(site=site, user=user).count() == 0:
+            site_member = SiteMember(site=site, user=user, email=user.email,
+                                     is_owner=False, is_staff=False)
+            site_member.save()
+
+    def _send_public_register_email(self, user):
+        context = {"user": user}
+
+        mbuilder = MagicMailBuilder()
+        email = mbuilder.public_register_user(user.email, context)
+        email.send()
+
+    def _public_register(self, request):
+        if not request.site.public_register:
+            raise exc.BadRequest("Public register is disabled for this site.")
+
+        serializer = PublicRegisterSerializer(data=request.DATA)
+        if not serializer.is_valid():
+            raise exc.BadRequest(serializer.errors)
+
+        data = serializer.data
+
+        user = User(username=data["username"],
+                    first_name=data["first_name"],
+                    last_name=data["last_name"],
+                    email=data["email"])
+        user.set_password(data["password"])
+        user.save()
+
+        self._create_site_member(user)
+
+        #self._send_public_register_email(user)
+
+        response_data = self._create_response(user)
+        return Response(response_data, status=status.HTTP_201_CREATED)
+
+    def _send_private_register_email(self, user, **kwargs):
+        context = {"user": user}
+        context.update(kwargs)
+
+        mbuilder = MagicMailBuilder()
+        email = mbuilder.private_register_user(user.email, context)
+        email.send()
+
+    def _private_register(self, request):
+        base_serializer = PrivateGenericRegisterSerializer(data=request.DATA)
+        if not base_serializer.is_valid():
+            raise exc.BadRequest(base_serializer.errors)
+
+        membership_model = get_model("projects", "Membership")
+        try:
+            membership = membership_model.objects.get(token=base_serializer.data["token"])
+        except membership_model.DoesNotExist as e:
+            raise exc.BadRequest("Invalid token") from e
+
+        if base_serializer.data["existing"]:
+            serializer = PrivateRegisterExistingSerializer(data=request.DATA)
+            if not serializer.is_valid():
+                raise exc.BadRequest(serializer.errors)
+
+            user = get_object_or_404(User, username=serializer.data["username"])
+            if not user.check_password(serializer.data["password"]):
+                raise exc.BadRequest({"password": "Incorrect password"})
+
+        else:
+            serializer = PrivateRegisterSerializer(data=request.DATA)
+            if not serializer.is_valid():
+                raise exc.BadRequest(serializer.errors)
+
+            data = serializer.data
+            user = User(username=data["username"],
+                        first_name=data["first_name"],
+                        last_name=data["last_name"],
+                        email=data["email"])
+            user.set_password(data["password"])
+            user.save()
+
+        self._create_site_member(user)
+
+        membership.user = user
+        membership.save()
+
+        #self._send_private_register_email(user, membership=membership)
+
+        response_data = self._create_response(user)
+        return Response(response_data, status=status.HTTP_201_CREATED)
+
+    @list_route(methods=["POST"], permission_classes=[AllowAny])
+    def register(self, request, **kwargs):
+        type = request.DATA.get("type", None)
+        if type == "public":
+            return self._public_register(request)
+        elif type == "private":
+            return self._private_register(request)
+
+        raise exc.BadRequest("invalid register type")
+
     def create(self, request, **kwargs):
         username = request.DATA.get('username', None)
         password = request.DATA.get('password', None)
@@ -29,7 +143,5 @@ class AuthViewSet(viewsets.ViewSet):
         if not user.check_password(password):
             raise exc.BadRequest("Invalid username or password")
 
-        serializer = UserSerializer(user)
-        response_data = serializer.data
-        response_data["auth_token"] = auth.get_token_for_user(user)
+        response_data = self._create_response(user)
         return Response(response_data, status=status.HTTP_200_OK)
diff --git a/greenmine/base/auth/serializers.py b/greenmine/base/auth/serializers.py
new file mode 100644
index 00000000..512873d8
--- /dev/null
+++ b/greenmine/base/auth/serializers.py
@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+
+from rest_framework import serializers
+
+class BaseRegisterSerializer(serializers.Serializer):
+    first_name = serializers.CharField(max_length=200)
+    last_name = serializers.CharField(max_length=200)
+    email = serializers.EmailField(max_length=200)
+    username = serializers.CharField(max_length=200)
+    password = serializers.CharField(min_length=4)
+
+
+class PublicRegisterSerializer(BaseRegisterSerializer):
+    pass
+
+
+class PrivateRegisterSerializer(BaseRegisterSerializer):
+    pass
+
+
+class PrivateGenericRegisterSerializer(serializers.Serializer):
+    token = serializers.CharField(max_length=255, required=True)
+    existing = serializers.BooleanField()
+    # existing = serializers.ChoiceField(choices=[("on", "on"), ("off", "off")])
+
+
+class PrivateRegisterExistingSerializer(serializers.Serializer):
+    username = serializers.CharField(max_length=200)
+    password = serializers.CharField(min_length=4)
diff --git a/greenmine/base/auth/tests/tests_auth.py b/greenmine/base/auth/tests/tests_auth.py
index c39878e8..3c8811b9 100644
--- a/greenmine/base/auth/tests/tests_auth.py
+++ b/greenmine/base/auth/tests/tests_auth.py
@@ -1,19 +1,28 @@
 # -*- coding: utf-8 -*-
 
+import uuid
+import json
+
 from django.core.urlresolvers import reverse
 from django.conf.urls import patterns, include, url
 from django import test
+from django.db.models import get_model
 
 from rest_framework.views import APIView
+from rest_framework import viewsets
 from rest_framework.permissions import IsAuthenticated
 from rest_framework.response import Response
 
 from greenmine import urls
 from greenmine.base import auth
-from greenmine.base.users.tests import create_user
+from greenmine.base.users.tests import create_user, create_site
+from greenmine.projects.tests import create_project
+
+from greenmine.base.models import Site, SiteMember
+from greenmine.projects.models import Membership
 
 
-class TestAuthView(APIView):
+class TestAuthView(viewsets.ViewSet):
     authentication_classes = (auth.Token,)
     permission_classes = (IsAuthenticated,)
 
@@ -22,11 +31,12 @@ class TestAuthView(APIView):
 
 
 urls.urlpatterns += patterns("",
-    url(r'^test-api/v1/auth/', TestAuthView.as_view(), name="test-token-auth"),
+    url(r'^test-api/v1/auth/', TestAuthView.as_view({"get": "get"}), name="test-token-auth"),
 )
 
 
-class SimpleTokenAuthTests(test.TestCase):
+class TokenAuthTests(test.TestCase):
+    fixtures = ["initial_site.json"]
     def setUp(self):
         self.user1 = create_user(1)
 
@@ -41,3 +51,129 @@ class SimpleTokenAuthTests(test.TestCase):
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.content, b'"ok"')
 
+
+class RegisterTests(test.TestCase):
+    def setUp(self):
+        self.user1 = create_user(1)
+        self.site1 = create_site("localhost1", True)
+        self.site2 = create_site("localhost2", False)
+        self.role = self._create_role()
+        self.project = create_project(1, self.user1)
+
+    def test_public_register_01(self):
+        data = {
+            "username": "pepe",
+            "password": "pepepepe",
+            "first_name": "pepe",
+            "last_name": "pepe",
+            "email": "pepe@pepe.com",
+            "type": "public",
+        }
+
+        url = reverse("auth-register")
+        response = self.client.post(url, data, HTTP_X_HOST=self.site1.name)
+        self.assertEqual(response.status_code, 201)
+
+        self.assertEqual(SiteMember.objects.filter(site=self.site1).count(), 1)
+        self.assertEqual(self.project.memberships.count(), 0)
+
+
+    def test_public_register_02(self):
+        data = {
+            "username": "pepe",
+            "password": "pepepepe",
+            "first_name": "pepe",
+            "last_name": "pepe",
+            "email": "pepe@pepe.com",
+            "type": "public",
+        }
+
+        url = reverse("auth-register")
+        response = self.client.post(url, data, HTTP_X_HOST=self.site2.name)
+        self.assertEqual(response.status_code, 400)
+
+    def test_private_register_01(self):
+        data = {
+            "username": "pepe",
+            "password": "pepepepe",
+            "first_name": "pepe",
+            "last_name": "pepe",
+            "email": "pepe@pepe.com",
+            "type": "private",
+        }
+
+        url = reverse("auth-register")
+        response = self.client.post(url, data, HTTP_X_HOST=self.site2.name)
+        self.assertEqual(response.status_code, 400)
+
+    def test_private_register_02(self):
+        membership = self._create_invitation("pepe@pepe.com")
+
+        data = {
+            "username": "pepe",
+            "password": "pepepepe",
+            "first_name": "pepe",
+            "last_name": "pepe",
+            "email": "pepe@pepe.com",
+            "type": "private",
+            "existing": False,
+            "token": membership.token,
+        }
+
+        self.assertEqual(self.project.memberships.exclude(user__isnull=True).count(), 0)
+
+        url = reverse("auth-register")
+        response = self.client.post(url, data=json.dumps(data),
+                                    content_type="application/json",
+                                    HTTP_X_HOST=self.site2.name)
+
+        self.assertEqual(response.status_code, 201)
+        self.assertEqual(self.project.memberships.exclude(user__isnull=True).count(), 1)
+        self.assertEqual(self.project.memberships.get().role, self.role)
+        self.assertEqual(SiteMember.objects.filter(site=self.site1).count(), 0)
+        self.assertEqual(SiteMember.objects.filter(site=self.site2).count(), 1)
+
+    def test_private_register_03(self):
+        membership = self._create_invitation("pepe@pepe.com")
+
+        data = {
+            "username": self.user1.username,
+            "password": self.user1.username,
+            "type": "private",
+            "existing": True,
+            "token": membership.token,
+        }
+
+        self.assertEqual(self.project.memberships.exclude(user__isnull=True).count(), 0)
+
+        url = reverse("auth-register")
+        response = self.client.post(url, data=json.dumps(data),
+                                    content_type="application/json",
+                                    HTTP_X_HOST=self.site2.name)
+
+        self.assertEqual(response.status_code, 201)
+        self.assertEqual(self.project.memberships.exclude(user__isnull=True).count(), 1)
+        self.assertEqual(self.project.memberships.get().role, self.role)
+        self.assertEqual(SiteMember.objects.filter(site=self.site1).count(), 0)
+        self.assertEqual(SiteMember.objects.filter(site=self.site2).count(), 1)
+
+
+    def _create_invitation(self, email):
+        token = str(uuid.uuid1())
+        membership_model = get_model("projects", "Membership")
+
+        instance = membership_model(project=self.project,
+                                    email=email,
+                                    role=self.role,
+                                    user=None,
+                                    token=token)
+        instance.save()
+        return instance
+
+    def _create_role(self):
+        role_model = get_model("users", "Role")
+        instance = role_model(name="foo", slug="foo",
+                              order=1, computable=True)
+
+        instance.save()
+        return instance
diff --git a/greenmine/base/exceptions.py b/greenmine/base/exceptions.py
index bd161330..eaee687e 100644
--- a/greenmine/base/exceptions.py
+++ b/greenmine/base/exceptions.py
@@ -2,6 +2,12 @@
 
 from rest_framework import exceptions
 from rest_framework import status
+from rest_framework.response import Response
+
+from django.core.exceptions import PermissionDenied as DjangoPermissionDenied
+from django.http import Http404
+
+from .utils.json import to_json
 
 
 class BaseException(exceptions.APIException):
@@ -66,3 +72,53 @@ class NotAuthenticated(exceptions.NotAuthenticated):
     exception.
     """
     pass
+
+
+def format_exception(exc):
+    # TODO: this method need a refactor.
+    # TODO: should return in uniform way all exceptions.
+
+    if isinstance(exc.detail, (dict, list, tuple,)):
+        detail = exc.detail
+    else:
+        class_name = exc.__class__.__name__
+        class_module = exc.__class__.__module__
+        detail = {
+            "_error_message": exc.detail,
+            "_error_type": "{0}.{1}".format(class_module, class_name)
+        }
+
+    return detail
+
+
+def exception_handler(exc):
+    """
+    Returns the response that should be used for any given exception.
+
+    By default we handle the REST framework `APIException`, and also
+    Django's builtin `Http404` and `PermissionDenied` exceptions.
+
+    Any unhandled exceptions may return `None`, which will cause a 500 error
+    to be raised.
+    """
+
+    if isinstance(exc, exceptions.APIException):
+        headers = {}
+        if getattr(exc, 'auth_header', None):
+            headers['WWW-Authenticate'] = exc.auth_header
+        if getattr(exc, 'wait', None):
+            headers['X-Throttle-Wait-Seconds'] = '%d' % exc.wait
+
+        detail = format_exception(exc)
+        return Response(detail, status=exc.status_code, headers=headers)
+
+    elif isinstance(exc, Http404):
+        return Response({'_error_message': 'Not found'},
+                        status=status.HTTP_404_NOT_FOUND)
+
+    elif isinstance(exc, DjangoPermissionDenied):
+        return Response({'_error_message': 'Permission denied'},
+                        status=status.HTTP_403_FORBIDDEN)
+
+    # Note: Unhandled exceptions will raise a 500 error.
+    return None
diff --git a/greenmine/base/fixtures/initial_site.json b/greenmine/base/fixtures/initial_site.json
new file mode 100644
index 00000000..a50d85c3
--- /dev/null
+++ b/greenmine/base/fixtures/initial_site.json
@@ -0,0 +1,10 @@
+[
+{
+    "model": "base.site", 
+    "fields": {
+        "domain": "localhost", 
+        "name": "localhost"
+    }, 
+    "pk": 1
+}
+]
diff --git a/greenmine/base/middleware.py b/greenmine/base/middleware.py
index 7f1dc98c..8f1591b0 100644
--- a/greenmine/base/middleware.py
+++ b/greenmine/base/middleware.py
@@ -1,32 +1,22 @@
-import time
+# -*- coding: utf-8 -*-
+
+import json
 
-from django.conf import settings
 from django import http
-from django.utils.cache import patch_vary_headers
-from django.utils.http import cookie_date
-from django.utils.importlib import import_module
-
-from django.contrib.sessions.middleware import SessionMiddleware
-
-
-class GreenmineSessionMiddleware(SessionMiddleware):
-    def process_request(self, request):
-        engine = import_module(settings.SESSION_ENGINE)
-        session_key = request.META.get(settings.SESSION_HEADER_NAME, None)
-        if not session_key:
-            session_key = request.COOKIES.get(settings.SESSION_COOKIE_NAME, None)
-        request.session = engine.SessionStore(session_key)
-
+from greenmine.base import sites
 
 
 COORS_ALLOWED_ORIGINS = '*'
-COORS_ALLOWED_METHODS = ['POST', 'GET', 'OPTIONS', 'PUT', 'DELETE', 'PATCH']
-COORS_ALLOWED_HEADERS = ['Content-Type', 'X-Requested-With',
-                         'Authorization', 'Accept-Encoding',
-                         'X-Disable-Pagination']
+COORS_ALLOWED_METHODS = ['POST', 'GET', 'OPTIONS', 'PUT', 'DELETE', 'PATCH', 'HEAD']
+COORS_ALLOWED_HEADERS = ['content-type', 'x-requested-with',
+                         'authorization', 'accept-encoding',
+                         'x-disable-pagination', 'x-host']
 COORS_ALLOWED_CREDENTIALS = True
-COORS_EXPOSE_HEADERS = ["x-pagination-count", "x-paginated",
-                        "x-paginated-by", "x-pagination-current"]
+COORS_EXPOSE_HEADERS = ["x-pagination-count", "x-paginated", "x-paginated-by",
+                        "x-paginated-by", "x-pagination-current", "x-site-host",
+                        "x-site-register"]
+
+from .exceptions import format_exception
 
 
 class CoorsMiddleware(object):
@@ -49,3 +39,28 @@ class CoorsMiddleware(object):
     def process_response(self, request, response):
         self._populate_response(response)
         return response
+
+
+class SitesMiddleware(object):
+    def process_request(self, request):
+        domain = request.META.get("HTTP_X_HOST", None)
+        if domain is not None:
+            try:
+                site = sites.get_site_for_domain(domain)
+            except sites.SiteNotFound as e:
+                detail = format_exception(e)
+                return http.HttpResponseBadRequest(json.dumps(detail))
+        else:
+            site = sites.get_default_site()
+
+        request.site = site
+        sites.activate(site)
+
+    def process_response(self, request, response):
+        sites.deactivate()
+
+        if hasattr(request, "site"):
+            response["X-Site-Host"] = request.site.domain
+            response["X-Site-Register"] = "on" if request.site.public_register else "off"
+
+        return response
diff --git a/greenmine/base/migrations/0001_initial.py b/greenmine/base/migrations/0001_initial.py
new file mode 100644
index 00000000..fc281e75
--- /dev/null
+++ b/greenmine/base/migrations/0001_initial.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+import datetime
+from south.db import db
+from south.v2 import SchemaMigration
+from django.db import models
+
+
+class Migration(SchemaMigration):
+
+    def forwards(self, orm):
+        pass
+
+    def backwards(self, orm):
+        pass
+
+    models = {
+        
+    }
+
+    complete_apps = ['base']
\ No newline at end of file
diff --git a/greenmine/base/migrations/0002_auto__add_site__add_sitemember__add_unique_sitemember_site_user.py b/greenmine/base/migrations/0002_auto__add_site__add_sitemember__add_unique_sitemember_site_user.py
new file mode 100644
index 00000000..c897f4dd
--- /dev/null
+++ b/greenmine/base/migrations/0002_auto__add_site__add_sitemember__add_unique_sitemember_site_user.py
@@ -0,0 +1,111 @@
+# -*- coding: utf-8 -*-
+import datetime
+from south.db import db
+from south.v2 import SchemaMigration
+from django.db import models
+
+
+class Migration(SchemaMigration):
+
+    def forwards(self, orm):
+        # Adding model 'Site'
+        db.create_table('base_site', (
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('domain', self.gf('django.db.models.fields.CharField')(unique=True, max_length=255)),
+            ('name', self.gf('django.db.models.fields.CharField')(max_length=255)),
+            ('scheme', self.gf('django.db.models.fields.CharField')(max_length=60, default=None, null=True)),
+            ('public_register', self.gf('django.db.models.fields.BooleanField')(default=False)),
+        ))
+        db.send_create_signal('base', ['Site'])
+
+        # Adding model 'SiteMember'
+        db.create_table('base_sitemember', (
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('site', self.gf('django.db.models.fields.related.ForeignKey')(related_name='+', to=orm['base.Site'])),
+            ('user', self.gf('django.db.models.fields.related.ForeignKey')(related_name='+', null=True, to=orm['users.User'])),
+            ('email', self.gf('django.db.models.fields.EmailField')(max_length=255)),
+            ('is_owner', self.gf('django.db.models.fields.BooleanField')(default=False)),
+            ('is_staff', self.gf('django.db.models.fields.BooleanField')(default=False)),
+        ))
+        db.send_create_signal('base', ['SiteMember'])
+
+        # Adding unique constraint on 'SiteMember', fields ['site', 'user']
+        db.create_unique('base_sitemember', ['site_id', 'user_id'])
+
+    def backwards(self, orm):
+        # Removing unique constraint on 'SiteMember', fields ['site', 'user']
+        db.delete_unique('base_sitemember', ['site_id', 'user_id'])
+
+        # Deleting model 'Site'
+        db.delete_table('base_site')
+
+        # Deleting model 'SiteMember'
+        db.delete_table('base_sitemember')
+
+
+    models = {
+        'auth.group': {
+            'Meta': {'object_name': 'Group'},
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '80'}),
+            'permissions': ('django.db.models.fields.related.ManyToManyField', [], {'blank': 'True', 'to': "orm['auth.Permission']", 'symmetrical': 'False'})
+        },
+        'auth.permission': {
+            'Meta': {'object_name': 'Permission', 'ordering': "('content_type__app_label', 'content_type__model', 'codename')", 'unique_together': "(('content_type', 'codename'),)"},
+            'codename': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['contenttypes.ContentType']"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '50'})
+        },
+        'base.site': {
+            'Meta': {'object_name': 'Site', 'ordering': "('domain',)"},
+            'domain': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '255'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'public_register': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'scheme': ('django.db.models.fields.CharField', [], {'max_length': '60', 'default': 'None', 'null': 'True'})
+        },
+        'base.sitemember': {
+            'Meta': {'object_name': 'SiteMember', 'ordering': "['email']", 'unique_together': "(('site', 'user'),)"},
+            'email': ('django.db.models.fields.EmailField', [], {'max_length': '255'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_owner': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'is_staff': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'site': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'+'", 'to': "orm['base.Site']"}),
+            'user': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'+'", 'null': 'True', 'to': "orm['users.User']"})
+        },
+        'contenttypes.contenttype': {
+            'Meta': {'object_name': 'ContentType', 'db_table': "'django_content_type'", 'ordering': "('name',)", 'unique_together': "(('app_label', 'model'),)"},
+            'app_label': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'model': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '100'})
+        },
+        'users.user': {
+            'Meta': {'object_name': 'User', 'ordering': "['username']"},
+            'color': ('django.db.models.fields.CharField', [], {'blank': 'True', 'max_length': '9', 'default': "'#669933'"}),
+            'colorize_tags': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'date_joined': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'default_language': ('django.db.models.fields.CharField', [], {'blank': 'True', 'max_length': '20', 'default': "''"}),
+            'default_timezone': ('django.db.models.fields.CharField', [], {'blank': 'True', 'max_length': '20', 'default': "''"}),
+            'description': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'email': ('django.db.models.fields.EmailField', [], {'blank': 'True', 'max_length': '75'}),
+            'first_name': ('django.db.models.fields.CharField', [], {'blank': 'True', 'max_length': '30'}),
+            'groups': ('django.db.models.fields.related.ManyToManyField', [], {'blank': 'True', 'to': "orm['auth.Group']", 'related_name': "'user_set'", 'symmetrical': 'False'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_active': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'is_staff': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'is_superuser': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'last_login': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'last_name': ('django.db.models.fields.CharField', [], {'blank': 'True', 'max_length': '30'}),
+            'notify_changes_by_me': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'notify_level': ('django.db.models.fields.CharField', [], {'max_length': '32', 'default': "'all_owned_projects'"}),
+            'password': ('django.db.models.fields.CharField', [], {'max_length': '128'}),
+            'photo': ('django.db.models.fields.files.FileField', [], {'blank': 'True', 'max_length': '500', 'null': 'True'}),
+            'token': ('django.db.models.fields.CharField', [], {'blank': 'True', 'max_length': '200', 'default': 'None', 'null': 'True'}),
+            'user_permissions': ('django.db.models.fields.related.ManyToManyField', [], {'blank': 'True', 'to': "orm['auth.Permission']", 'related_name': "'user_set'", 'symmetrical': 'False'}),
+            'username': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '30'})
+        }
+    }
+
+    complete_apps = ['base']
diff --git a/greenmine/base/migrations/0003_initial_sites_data.py b/greenmine/base/migrations/0003_initial_sites_data.py
new file mode 100644
index 00000000..ea161e97
--- /dev/null
+++ b/greenmine/base/migrations/0003_initial_sites_data.py
@@ -0,0 +1,95 @@
+# -*- coding: utf-8 -*-
+import datetime
+from south.db import db
+from south.v2 import DataMigration
+from django.db import models
+
+class Migration(DataMigration):
+
+    def forwards(self, orm):
+        "Write your forwards methods here."
+        # Note: Don't use "from appname.models import ModelName".
+        # Use orm.ModelName to refer to models in this application,
+        # and orm['appname.ModelName'] for models in other applications.
+
+        from django.core.management import call_command
+        call_command("loaddata", "initial_site.json")
+
+        site = orm["base.Site"].objects.get(pk=1)
+
+        for user in orm["users.User"].objects.all():
+            orm["base.SiteMember"].objects.create(user=user, site=site, email=user.email)
+
+        orm["base.SiteMember"].objects.filter(user_id=1).update(is_staff=True, is_owner=True)
+
+
+    def backwards(self, orm):
+        "Write your backwards methods here."
+
+    models = {
+        'auth.group': {
+            'Meta': {'object_name': 'Group'},
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '80'}),
+            'permissions': ('django.db.models.fields.related.ManyToManyField', [], {'symmetrical': 'False', 'blank': 'True', 'to': "orm['auth.Permission']"})
+        },
+        'auth.permission': {
+            'Meta': {'unique_together': "(('content_type', 'codename'),)", 'object_name': 'Permission', 'ordering': "('content_type__app_label', 'content_type__model', 'codename')"},
+            'codename': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['contenttypes.ContentType']"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '50'})
+        },
+        'base.site': {
+            'Meta': {'object_name': 'Site', 'ordering': "('domain',)"},
+            'domain': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '255'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'public_register': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'scheme': ('django.db.models.fields.CharField', [], {'default': 'None', 'null': 'True', 'max_length': '60'})
+        },
+        'base.sitemember': {
+            'Meta': {'unique_together': "(('site', 'user'),)", 'object_name': 'SiteMember', 'ordering': "['email']"},
+            'email': ('django.db.models.fields.EmailField', [], {'max_length': '255'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_owner': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'is_staff': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'site': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'+'", 'to': "orm['base.Site']"}),
+            'user': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'+'", 'to': "orm['users.User']", 'null': 'True'})
+        },
+        'contenttypes.contenttype': {
+            'Meta': {'unique_together': "(('app_label', 'model'),)", 'object_name': 'ContentType', 'db_table': "'django_content_type'", 'ordering': "('name',)"},
+            'app_label': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'model': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '100'})
+        },
+        'users.user': {
+            'Meta': {'object_name': 'User', 'ordering': "['username']"},
+            'color': ('django.db.models.fields.CharField', [], {'default': "'#669933'", 'blank': 'True', 'max_length': '9'}),
+            'colorize_tags': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'date_joined': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'default_language': ('django.db.models.fields.CharField', [], {'default': "''", 'blank': 'True', 'max_length': '20'}),
+            'default_timezone': ('django.db.models.fields.CharField', [], {'default': "''", 'blank': 'True', 'max_length': '20'}),
+            'description': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'email': ('django.db.models.fields.EmailField', [], {'blank': 'True', 'max_length': '75'}),
+            'first_name': ('django.db.models.fields.CharField', [], {'blank': 'True', 'max_length': '30'}),
+            'groups': ('django.db.models.fields.related.ManyToManyField', [], {'blank': 'True', 'symmetrical': 'False', 'related_name': "'user_set'", 'to': "orm['auth.Group']"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_active': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'is_staff': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'is_superuser': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'last_login': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'last_name': ('django.db.models.fields.CharField', [], {'blank': 'True', 'max_length': '30'}),
+            'notify_changes_by_me': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'notify_level': ('django.db.models.fields.CharField', [], {'default': "'all_owned_projects'", 'max_length': '32'}),
+            'password': ('django.db.models.fields.CharField', [], {'max_length': '128'}),
+            'photo': ('django.db.models.fields.files.FileField', [], {'blank': 'True', 'null': 'True', 'max_length': '500'}),
+            'token': ('django.db.models.fields.CharField', [], {'default': 'None', 'blank': 'True', 'null': 'True', 'max_length': '200'}),
+            'user_permissions': ('django.db.models.fields.related.ManyToManyField', [], {'blank': 'True', 'symmetrical': 'False', 'related_name': "'user_set'", 'to': "orm['auth.Permission']"}),
+            'username': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '30'})
+        }
+    }
+
+    complete_apps = ['base']
+    symmetrical = True
diff --git a/greenmine/base/migrations/__init__.py b/greenmine/base/migrations/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/greenmine/base/models.py b/greenmine/base/models.py
index d0ca951c..afa278df 100644
--- a/greenmine/base/models.py
+++ b/greenmine/base/models.py
@@ -1,8 +1,74 @@
 # -*- coding: utf-8 -*-
 
+import string
+
+from django.db import models
+from django.db.models.signals import pre_save, pre_delete
+from django.utils.translation import ugettext_lazy as _
+from django.core.exceptions import ValidationError
+
+from . import sites
+
+
+def _simple_domain_name_validator(value):
+    """
+    Validates that the given value contains no whitespaces to prevent common
+    typos.
+    """
+    if not value:
+        return
+    checks = ((s in value) for s in string.whitespace)
+    if any(checks):
+        raise ValidationError(
+            _("The domain name cannot contain any spaces or tabs."),
+            code='invalid',
+        )
+
+
+class Site(models.Model):
+    domain = models.CharField(_('domain name'), max_length=255, unique=True,
+                              validators=[_simple_domain_name_validator])
+    name = models.CharField(_('display name'), max_length=255)
+    scheme = models.CharField(_('scheme'), max_length=60, null=True, default=None)
+
+    # Site Metadata
+    public_register = models.BooleanField(default=False)
+
+    class Meta:
+        verbose_name = _('site')
+        verbose_name_plural = _('sites')
+        ordering = ('domain',)
+
+    def __str__(self):
+        return self.domain
+
+
+class SiteMember(models.Model):
+    site = models.ForeignKey("Site", related_name="+")
+    user = models.ForeignKey("users.User", related_name="+", null=True)
+
+    email = models.EmailField(max_length=255)
+    is_owner = models.BooleanField(default=False)
+    is_staff = models.BooleanField(default=False)
+
+    class Meta:
+        ordering = ["email"]
+        verbose_name = "Site Member"
+        verbose_name_plural = "Site Members"
+        unique_together = ("site", "user")
+
+    def __str__(self):
+        return "SiteMember: {0}:{1}".format(self.site, self.user)
+
+
+pre_save.connect(sites.clear_site_cache, sender=Site)
+pre_delete.connect(sites.clear_site_cache, sender=Site)
+
+
 # Patch api view for correctly return 401 responses on
 # request is authenticated instead of 403
 from . import monkey
 monkey.patch_api_view()
 monkey.patch_serializer()
 monkey.patch_import_module()
+monkey.patch_south_hacks()
diff --git a/greenmine/base/monkey.py b/greenmine/base/monkey.py
index 83531c62..1bbb6967 100644
--- a/greenmine/base/monkey.py
+++ b/greenmine/base/monkey.py
@@ -66,3 +66,18 @@ def patch_import_module():
     import importlib
 
     django_importlib.import_module = importlib.import_module
+
+
+def patch_south_hacks():
+    from south.hacks import django_1_0
+
+    orig_set_installed_apps = django_1_0.Hacks.set_installed_apps
+    def set_installed_apps(self, apps, preserve_models=True):
+        return orig_set_installed_apps(self, apps, preserve_models=preserve_models)
+
+    orig__redo_app_cache = django_1_0.Hacks._redo_app_cache
+    def _redo_app_cache(self, preserve_models=True):
+        return orig__redo_app_cache(self, preserve_models=preserve_models)
+
+    django_1_0.Hacks.set_installed_apps = set_installed_apps
+    django_1_0.Hacks._redo_app_cache = _redo_app_cache
diff --git a/greenmine/base/sites.py b/greenmine/base/sites.py
new file mode 100644
index 00000000..4bf024ac
--- /dev/null
+++ b/greenmine/base/sites.py
@@ -0,0 +1,82 @@
+# -*- coding: utf-8 -*-
+
+import logging
+from threading import local
+
+from django.db.models import get_model
+from django.core.exceptions import ImproperlyConfigured
+
+from . import exceptions as exc
+
+
+_local = local()
+log = logging.getLogger("greenmine.sites")
+
+
+class SiteNotFound(exc.BaseException):
+    pass
+
+
+def get_default_site():
+    from django.conf import settings
+    try:
+        sid = settings.SITE_ID
+    except AttributeError:
+        raise ImproperlyConfigured("You're using the \"sites framework\" without having "
+                                   "set the SITE_ID setting. Create a site in your database "
+                                   "and set the SITE_ID setting to fix this error.")
+
+    model_cls = get_model("base", "Site")
+    cached = getattr(_local, "default_site", None)
+    if cached is None:
+        try:
+            cached = _local.default_site = model_cls.objects.get(pk=sid)
+        except model_cls.DoesNotExist:
+            raise ImproperlyConfigured("default site not found on database.")
+
+    return cached
+
+
+def get_site_for_domain(domain):
+    log.debug("Trying activate site for domain: {}".format(domain))
+    cache = getattr(_local, "cache", {})
+
+    if domain in cache:
+        return cache[domain]
+
+    model_cls = get_model("base", "Site")
+
+    try:
+        site = model_cls.objects.get(domain=domain)
+    except model_cls.DoesNotExist:
+        log.warning("Site does not exist for domain: {}".format(domain))
+        raise SiteNotFound("site not found")
+    else:
+        cache[domain] = site
+
+    return site
+
+
+def activate(site):
+    log.debug("Activating site: {}".format(site))
+    _local.active_site = site
+
+
+def deactivate():
+    if hasattr(_local, "active_site"):
+        log.debug("Deactivating site: {}".format(_local.active_site))
+        del _local.active_site
+
+
+def get_active_site():
+    active_site = getattr(_local, "active_site", None)
+    if active_site is None:
+        return get_default_site()
+    return active_site
+
+def clear_site_cache(**kwargs):
+    if hasattr(_local, "default_site"):
+        del _local.default_site
+
+    if hasattr(_local, "cache"):
+        del _local.cache
diff --git a/greenmine/base/users/api.py b/greenmine/base/users/api.py
index 60fd7c84..a0c4f63f 100644
--- a/greenmine/base/users/api.py
+++ b/greenmine/base/users/api.py
@@ -15,55 +15,17 @@ from djmail.template_mail import MagicMailBuilder
 
 from greenmine.base import exceptions as exc
 from greenmine.base.filters import FilterBackend
-from greenmine.base.api import ModelCrudViewSet
+from greenmine.base.api import ModelCrudViewSet, RetrieveModelMixin
 
 from .models import User, Role
 from .serializers import UserSerializer, RoleSerializer, RecoverySerializer
 
 
-class RolesViewSet(viewsets.ViewSet):
-    permission_classes = (IsAuthenticated,)
-    serializer_class = RoleSerializer
-
-    def list(self, request, pk=None):
-        queryset = Role.objects.all()
-        serializer = self.serializer_class(queryset, many=True)
-        return Response(serializer.data)
-
-    def retrieve(self, request, pk=None):
-        try:
-            role = Role.objects.get(pk=pk)
-        except Role.DoesNotExist:
-            raise exc.NotFound()
-
-        serializer = self.serializer_class(role)
-        return Response(serializer.data)
-
-
-class ProjectMembershipFilter(FilterBackend):
-    def filter_queryset(self, request, queryset, view):
-        queryset = super().filter_queryset(request, queryset, view)
-
-        if request.user.is_superuser:
-            return queryset
-
-        project_model = get_model("projects", "Project")
-        own_projects = project_model.objects.filter(members=request.user)
-
-        project = request.QUERY_PARAMS.get('project', None)
-        if project is not None:
-            own_projects = own_projects.filter(pk=project)
-
-        queryset = (queryset.filter(projects__in=own_projects)
-                            .order_by('username').distinct())
-        return queryset
-
 
 class UsersViewSet(ModelCrudViewSet):
     permission_classes = (IsAuthenticated,)
     serializer_class = UserSerializer
     queryset = User.objects.all()
-    filter_backends = (ProjectMembershipFilter,)
     filter_fields = [("project", "memberships__project__pk")]
 
     def pre_conditions_on_save(self, obj):
@@ -129,3 +91,22 @@ class UsersViewSet(ModelCrudViewSet):
         request.user.set_password(password)
         request.user.save(update_fields=["password"])
         return Response(status=status.HTTP_204_NO_CONTENT)
+
+
+class RolesViewSet(viewsets.ViewSet):
+    permission_classes = (IsAuthenticated,)
+    serializer_class = RoleSerializer
+
+    def list(self, request, pk=None):
+        queryset = Role.objects.all()
+        serializer = self.serializer_class(queryset, many=True)
+        return Response(serializer.data)
+
+    def retrieve(self, request, pk=None):
+        try:
+            role = Role.objects.get(pk=pk)
+        except Role.DoesNotExist:
+            raise exc.NotFound()
+
+        serializer = self.serializer_class(role)
+        return Response(serializer.data)
diff --git a/greenmine/base/users/tests/__init__.py b/greenmine/base/users/tests/__init__.py
index 29fff068..8e22a779 100644
--- a/greenmine/base/users/tests/__init__.py
+++ b/greenmine/base/users/tests/__init__.py
@@ -21,3 +21,14 @@ def create_user(id, save=True, is_superuser=False):
     if save:
         instance.save()
     return instance
+
+
+def create_site(name, public_register=False):
+    site_model = get_model("base", "Site")
+
+    instance = site_model(name=name,
+                          domain=name,
+                          public_register=public_register)
+
+    instance.save()
+    return instance
diff --git a/greenmine/base/utils/json.py b/greenmine/base/utils/json.py
new file mode 100644
index 00000000..b212339f
--- /dev/null
+++ b/greenmine/base/utils/json.py
@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+
+import json
+from rest_framework.utils import encoders
+
+
+def to_json(data, ensure_ascii=True, encoder_class=encoders.JSONEncoder):
+    return json.dumps(data, cls=encoder_class, indent=None, ensure_ascii=ensure_ascii)
+
+
+def from_json(data):
+    return json.loads(data)
diff --git a/greenmine/front/__init__.py b/greenmine/front/__init__.py
index 1f9b2784..7262609e 100644
--- a/greenmine/front/__init__.py
+++ b/greenmine/front/__init__.py
@@ -1,10 +1,10 @@
 # -*- coding: utf-8 -*-
 
 from django.conf import settings
-import django_sites as sites
-
 from django_jinja import library
 
+from greenmine.base import sites
+
 
 URLS = {
     "home": "/",
@@ -15,20 +15,16 @@ URLS = {
     "issue": "/#/project/{0}/issues/{1}",
     "project-admin": "/#/project/{0}/admin",
     "change-password": "/#/change-password/{0}",
+    "invitation": "/#/invitation/{0}",
 }
 
 
 lib = library.Library()
 
-def get_current_site():
-    current_site_id = getattr(settings, "SITE_ID")
-    front_sites = getattr(settings, "SITES_FRONT")
-    return sites.Site(front_sites[current_site_id])
-
 
 @lib.global_function(name="resolve_front_url")
 def resolve(type, *args):
-    site = get_current_site()
+    site = sites.get_active_site()
     url_tmpl = "{scheme}//{domain}{url}"
 
     scheme = site.scheme and "{0}:".format(site.scheme) or ""
diff --git a/greenmine/projects/api.py b/greenmine/projects/api.py
index c8ae67b2..de864671 100644
--- a/greenmine/projects/api.py
+++ b/greenmine/projects/api.py
@@ -1,13 +1,20 @@
 # -*- coding: utf-8 -*-
 
+import uuid
+
 from django.db.models import Q
 
-from rest_framework.permissions import IsAuthenticated
+from rest_framework.permissions import IsAuthenticated, AllowAny
 from rest_framework.response import Response
 from rest_framework.decorators import detail_route
+from rest_framework import viewsets
+from rest_framework import status
+
+from djmail.template_mail import MagicMailBuilder
 
 from greenmine.base import filters
-from greenmine.base.api import ModelCrudViewSet, ModelListViewSet
+from greenmine.base import exceptions as exc
+from greenmine.base.api import ModelCrudViewSet, ModelListViewSet, RetrieveModelMixin
 from greenmine.base.notifications.api import NotificationSenderMixin
 from greenmine.projects.aggregates.tags import get_all_tags
 
@@ -53,6 +60,12 @@ class ProjectViewSet(ModelCrudViewSet):
 
     def pre_save(self, obj):
         obj.owner = self.request.user
+
+        # Assign site only if it current
+        # value is None
+        if not obj.site:
+            obj.site = self.request.site
+
         super().pre_save(obj)
 
 
@@ -61,6 +74,54 @@ class MembershipViewSet(ModelCrudViewSet):
     serializer_class = serializers.MembershipSerializer
     permission_classes = (IsAuthenticated, permissions.MembershipPermission)
 
+    def create(self, request, *args, **kwargs):
+        serializer = self.get_serializer(data=request.DATA, files=request.FILES)
+
+        if serializer.is_valid():
+            qs = self.model.objects.filter(Q(project_id=serializer.data["project"],
+                                             user__email=serializer.data["email"]) |
+                                           Q(project_id=serializer.data["project"],
+                                             email=serializer.data["email"]))
+            if qs.count() > 0:
+                raise exc.WrongArguments("Already exist user with specified email address.")
+
+            self.pre_save(serializer.object)
+            self.object = serializer.save(force_insert=True)
+            self.post_save(self.object, created=True)
+            headers = self.get_success_headers(serializer.data)
+            return Response(serializer.data, status=status.HTTP_201_CREATED,
+                            headers=headers)
+
+        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
+
+    def pre_save(self, object):
+        # Only assign new token if a current token value is empty.
+        if not object.token:
+            object.token = str(uuid.uuid1())
+
+        super().pre_save(object)
+
+    def post_save(self, object, created=False):
+        super().post_save(object, created=created)
+
+        if not created:
+            return
+
+        # Send email only if a new membership is created
+        mbuilder = MagicMailBuilder()
+        email = mbuilder.membership_invitation(object.email, {"membership": object})
+        email.send()
+
+
+class InvitationViewSet(RetrieveModelMixin, viewsets.GenericViewSet):
+    """
+    Only used by front for get invitation by it token.
+    """
+    queryset = models.Membership.objects.all()
+    serializer_class = serializers.MembershipSerializer
+    lookup_field = "token"
+    permission_classes = (AllowAny,)
+
 
 # User Stories commin ViewSets
 
diff --git a/greenmine/projects/migrations/0005_auto__add_field_project_site__add_field_membership_email__add_field_me.py b/greenmine/projects/migrations/0005_auto__add_field_project_site__add_field_membership_email__add_field_me.py
new file mode 100644
index 00000000..0fba441e
--- /dev/null
+++ b/greenmine/projects/migrations/0005_auto__add_field_project_site__add_field_membership_email__add_field_me.py
@@ -0,0 +1,242 @@
+# -*- coding: utf-8 -*-
+import datetime
+from south.db import db
+from south.v2 import SchemaMigration
+from django.db import models
+
+
+class Migration(SchemaMigration):
+
+    def forwards(self, orm):
+        # Removing unique constraint on 'Membership', fields ['user', 'project']
+        db.delete_unique('projects_membership', ['user_id', 'project_id'])
+
+        # Adding field 'Project.site'
+        db.add_column('projects_project', 'site',
+                      self.gf('django.db.models.fields.related.ForeignKey')(default=None, related_name='projects', null=True, to=orm['base.Site']),
+                      keep_default=False)
+
+        # Adding field 'Membership.email'
+        db.add_column('projects_membership', 'email',
+                      self.gf('django.db.models.fields.EmailField')(max_length=255, default=None, null=True),
+                      keep_default=False)
+
+        # Adding field 'Membership.created_at'
+        db.add_column('projects_membership', 'created_at',
+                      self.gf('django.db.models.fields.DateTimeField')(default=datetime.datetime.now, blank=True, auto_now_add=True),
+                      keep_default=False)
+
+        # Adding field 'Membership.token'
+        db.add_column('projects_membership', 'token',
+                      self.gf('django.db.models.fields.CharField')(max_length=60, default=None, blank=True, null=True, unique=True),
+                      keep_default=False)
+
+
+        # Changing field 'Membership.user'
+        db.alter_column('projects_membership', 'user_id', self.gf('django.db.models.fields.related.ForeignKey')(null=True, to=orm['users.User']))
+
+    def backwards(self, orm):
+        # Deleting field 'Project.site'
+        db.delete_column('projects_project', 'site_id')
+
+        # Deleting field 'Membership.email'
+        db.delete_column('projects_membership', 'email')
+
+        # Deleting field 'Membership.created_at'
+        db.delete_column('projects_membership', 'created_at')
+
+        # Deleting field 'Membership.token'
+        db.delete_column('projects_membership', 'token')
+
+
+        # User chose to not deal with backwards NULL issues for 'Membership.user'
+        raise RuntimeError("Cannot reverse this migration. 'Membership.user' and its values cannot be restored.")
+        
+        # The following code is provided here to aid in writing a correct migration
+        # Changing field 'Membership.user'
+        db.alter_column('projects_membership', 'user_id', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['users.User']))
+        # Adding unique constraint on 'Membership', fields ['user', 'project']
+        db.create_unique('projects_membership', ['user_id', 'project_id'])
+
+
+    models = {
+        'auth.group': {
+            'Meta': {'object_name': 'Group'},
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '80', 'unique': 'True'}),
+            'permissions': ('django.db.models.fields.related.ManyToManyField', [], {'symmetrical': 'False', 'blank': 'True', 'to': "orm['auth.Permission']"})
+        },
+        'auth.permission': {
+            'Meta': {'object_name': 'Permission', 'ordering': "('content_type__app_label', 'content_type__model', 'codename')", 'unique_together': "(('content_type', 'codename'),)"},
+            'codename': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['contenttypes.ContentType']"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '50'})
+        },
+        'base.site': {
+            'Meta': {'object_name': 'Site', 'ordering': "('domain',)"},
+            'domain': ('django.db.models.fields.CharField', [], {'max_length': '255', 'unique': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'public_register': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'scheme': ('django.db.models.fields.CharField', [], {'max_length': '60', 'default': 'None', 'null': 'True'})
+        },
+        'contenttypes.contenttype': {
+            'Meta': {'object_name': 'ContentType', 'ordering': "('name',)", 'unique_together': "(('app_label', 'model'),)", 'db_table': "'django_content_type'"},
+            'app_label': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'model': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '100'})
+        },
+        'projects.attachment': {
+            'Meta': {'object_name': 'Attachment', 'ordering': "['project', 'created_date']"},
+            'attached_file': ('django.db.models.fields.files.FileField', [], {'max_length': '500', 'null': 'True', 'blank': 'True'}),
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['contenttypes.ContentType']"}),
+            'created_date': ('django.db.models.fields.DateTimeField', [], {'blank': 'True', 'auto_now_add': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'modified_date': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'}),
+            'object_id': ('django.db.models.fields.PositiveIntegerField', [], {}),
+            'owner': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'change_attachments'", 'to': "orm['users.User']"}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'attachments'", 'to': "orm['projects.Project']"})
+        },
+        'projects.issuestatus': {
+            'Meta': {'object_name': 'IssueStatus', 'ordering': "['project', 'order', 'name']", 'unique_together': "(('project', 'name'),)"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_closed': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'issue_statuses'", 'to': "orm['projects.Project']"})
+        },
+        'projects.issuetype': {
+            'Meta': {'object_name': 'IssueType', 'ordering': "['project', 'order', 'name']", 'unique_together': "(('project', 'name'),)"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'issue_types'", 'to': "orm['projects.Project']"})
+        },
+        'projects.membership': {
+            'Meta': {'object_name': 'Membership', 'ordering': "['project', 'role']"},
+            'created_at': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now', 'blank': 'True', 'auto_now_add': 'True'}),
+            'email': ('django.db.models.fields.EmailField', [], {'max_length': '255', 'default': 'None', 'null': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'memberships'", 'to': "orm['projects.Project']"}),
+            'role': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'memberships'", 'to': "orm['users.Role']"}),
+            'token': ('django.db.models.fields.CharField', [], {'max_length': '60', 'default': 'None', 'blank': 'True', 'null': 'True', 'unique': 'True'}),
+            'user': ('django.db.models.fields.related.ForeignKey', [], {'default': 'None', 'related_name': "'memberships'", 'null': 'True', 'to': "orm['users.User']", 'blank': 'True'})
+        },
+        'projects.points': {
+            'Meta': {'object_name': 'Points', 'ordering': "['project', 'order', 'name']", 'unique_together': "(('project', 'name'),)"},
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'points'", 'to': "orm['projects.Project']"}),
+            'value': ('django.db.models.fields.FloatField', [], {'default': 'None', 'null': 'True', 'blank': 'True'})
+        },
+        'projects.priority': {
+            'Meta': {'object_name': 'Priority', 'ordering': "['project', 'order', 'name']", 'unique_together': "(('project', 'name'),)"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'priorities'", 'to': "orm['projects.Project']"})
+        },
+        'projects.project': {
+            'Meta': {'object_name': 'Project', 'ordering': "['name']"},
+            'created_date': ('django.db.models.fields.DateTimeField', [], {'blank': 'True', 'auto_now_add': 'True'}),
+            'default_issue_status': ('django.db.models.fields.related.OneToOneField', [], {'unique': 'True', 'related_name': "'+'", 'null': 'True', 'to': "orm['projects.IssueStatus']", 'on_delete': 'models.SET_NULL', 'blank': 'True'}),
+            'default_issue_type': ('django.db.models.fields.related.OneToOneField', [], {'unique': 'True', 'related_name': "'+'", 'null': 'True', 'to': "orm['projects.IssueType']", 'on_delete': 'models.SET_NULL', 'blank': 'True'}),
+            'default_points': ('django.db.models.fields.related.OneToOneField', [], {'unique': 'True', 'related_name': "'+'", 'null': 'True', 'to': "orm['projects.Points']", 'on_delete': 'models.SET_NULL', 'blank': 'True'}),
+            'default_priority': ('django.db.models.fields.related.OneToOneField', [], {'unique': 'True', 'related_name': "'+'", 'null': 'True', 'to': "orm['projects.Priority']", 'on_delete': 'models.SET_NULL', 'blank': 'True'}),
+            'default_question_status': ('django.db.models.fields.related.OneToOneField', [], {'unique': 'True', 'related_name': "'+'", 'null': 'True', 'to': "orm['projects.QuestionStatus']", 'on_delete': 'models.SET_NULL', 'blank': 'True'}),
+            'default_severity': ('django.db.models.fields.related.OneToOneField', [], {'unique': 'True', 'related_name': "'+'", 'null': 'True', 'to': "orm['projects.Severity']", 'on_delete': 'models.SET_NULL', 'blank': 'True'}),
+            'default_task_status': ('django.db.models.fields.related.OneToOneField', [], {'unique': 'True', 'related_name': "'+'", 'null': 'True', 'to': "orm['projects.TaskStatus']", 'on_delete': 'models.SET_NULL', 'blank': 'True'}),
+            'default_us_status': ('django.db.models.fields.related.OneToOneField', [], {'unique': 'True', 'related_name': "'+'", 'null': 'True', 'to': "orm['projects.UserStoryStatus']", 'on_delete': 'models.SET_NULL', 'blank': 'True'}),
+            'description': ('django.db.models.fields.TextField', [], {}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'last_issue_ref': ('django.db.models.fields.BigIntegerField', [], {'default': '1', 'null': 'True'}),
+            'last_task_ref': ('django.db.models.fields.BigIntegerField', [], {'default': '1', 'null': 'True'}),
+            'last_us_ref': ('django.db.models.fields.BigIntegerField', [], {'default': '1', 'null': 'True'}),
+            'members': ('django.db.models.fields.related.ManyToManyField', [], {'symmetrical': 'False', 'related_name': "'projects'", 'through': "orm['projects.Membership']", 'to': "orm['users.User']"}),
+            'modified_date': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '250', 'unique': 'True'}),
+            'owner': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'owned_projects'", 'to': "orm['users.User']"}),
+            'public': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'site': ('django.db.models.fields.related.ForeignKey', [], {'default': 'None', 'related_name': "'projects'", 'null': 'True', 'to': "orm['base.Site']"}),
+            'slug': ('django.db.models.fields.SlugField', [], {'max_length': '250', 'blank': 'True', 'unique': 'True'}),
+            'tags': ('picklefield.fields.PickledObjectField', [], {'blank': 'True'}),
+            'total_milestones': ('django.db.models.fields.IntegerField', [], {'default': '0', 'null': 'True', 'blank': 'True'}),
+            'total_story_points': ('django.db.models.fields.FloatField', [], {'default': 'None', 'null': 'True'})
+        },
+        'projects.questionstatus': {
+            'Meta': {'object_name': 'QuestionStatus', 'ordering': "['project', 'order', 'name']", 'unique_together': "(('project', 'name'),)"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_closed': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'question_status'", 'to': "orm['projects.Project']"})
+        },
+        'projects.severity': {
+            'Meta': {'object_name': 'Severity', 'ordering': "['project', 'order', 'name']", 'unique_together': "(('project', 'name'),)"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'severities'", 'to': "orm['projects.Project']"})
+        },
+        'projects.taskstatus': {
+            'Meta': {'object_name': 'TaskStatus', 'ordering': "['project', 'order', 'name']", 'unique_together': "(('project', 'name'),)"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_closed': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'task_statuses'", 'to': "orm['projects.Project']"})
+        },
+        'projects.userstorystatus': {
+            'Meta': {'object_name': 'UserStoryStatus', 'ordering': "['project', 'order', 'name']", 'unique_together': "(('project', 'name'),)"},
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_closed': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'us_statuses'", 'to': "orm['projects.Project']"})
+        },
+        'users.role': {
+            'Meta': {'object_name': 'Role', 'ordering': "['order', 'slug']"},
+            'computable': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '200'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'permissions': ('django.db.models.fields.related.ManyToManyField', [], {'symmetrical': 'False', 'related_name': "'roles'", 'to': "orm['auth.Permission']"}),
+            'slug': ('django.db.models.fields.SlugField', [], {'max_length': '250', 'blank': 'True', 'unique': 'True'})
+        },
+        'users.user': {
+            'Meta': {'object_name': 'User', 'ordering': "['username']"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '9', 'default': "'#669933'", 'blank': 'True'}),
+            'colorize_tags': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'date_joined': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'default_language': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "''", 'blank': 'True'}),
+            'default_timezone': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "''", 'blank': 'True'}),
+            'description': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'email': ('django.db.models.fields.EmailField', [], {'max_length': '75', 'blank': 'True'}),
+            'first_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
+            'groups': ('django.db.models.fields.related.ManyToManyField', [], {'symmetrical': 'False', 'related_name': "'user_set'", 'blank': 'True', 'to': "orm['auth.Group']"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_active': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'is_staff': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'is_superuser': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'last_login': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'last_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
+            'notify_changes_by_me': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'notify_level': ('django.db.models.fields.CharField', [], {'max_length': '32', 'default': "'all_owned_projects'"}),
+            'password': ('django.db.models.fields.CharField', [], {'max_length': '128'}),
+            'photo': ('django.db.models.fields.files.FileField', [], {'max_length': '500', 'null': 'True', 'blank': 'True'}),
+            'token': ('django.db.models.fields.CharField', [], {'max_length': '200', 'default': 'None', 'null': 'True', 'blank': 'True'}),
+            'user_permissions': ('django.db.models.fields.related.ManyToManyField', [], {'symmetrical': 'False', 'related_name': "'user_set'", 'blank': 'True', 'to': "orm['auth.Permission']"}),
+            'username': ('django.db.models.fields.CharField', [], {'max_length': '30', 'unique': 'True'})
+        }
+    }
+
+    complete_apps = ['projects']
\ No newline at end of file
diff --git a/greenmine/projects/migrations/0006_initial_sites_data.py b/greenmine/projects/migrations/0006_initial_sites_data.py
new file mode 100644
index 00000000..88392fb1
--- /dev/null
+++ b/greenmine/projects/migrations/0006_initial_sites_data.py
@@ -0,0 +1,210 @@
+# -*- coding: utf-8 -*-
+import datetime
+from south.db import db
+from south.v2 import DataMigration
+from django.db import models
+
+class Migration(DataMigration):
+    depends_on = (
+        ("base", "0003_initial_sites_data"),
+    )
+
+    def forwards(self, orm):
+        "Write your forwards methods here."
+        # Note: Don't use "from appname.models import ModelName".
+        # Use orm.ModelName to refer to models in this application,
+        # and orm['appname.ModelName'] for models in other applications.
+        site = orm["base.Site"].objects.get(pk=1)
+        for project in orm["projects.Project"].objects.all():
+            project.site = site
+            project.save()
+
+        for member in orm["projects.Membership"].objects.all():
+            member.email = member.user.email
+            member.save()
+
+    def backwards(self, orm):
+        "Write your backwards methods here."
+
+    models = {
+        'auth.group': {
+            'Meta': {'object_name': 'Group'},
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '80', 'unique': 'True'}),
+            'permissions': ('django.db.models.fields.related.ManyToManyField', [], {'symmetrical': 'False', 'blank': 'True', 'to': "orm['auth.Permission']"})
+        },
+        'auth.permission': {
+            'Meta': {'object_name': 'Permission', 'unique_together': "(('content_type', 'codename'),)", 'ordering': "('content_type__app_label', 'content_type__model', 'codename')"},
+            'codename': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['contenttypes.ContentType']"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '50'})
+        },
+        'base.site': {
+            'Meta': {'object_name': 'Site', 'ordering': "('domain',)"},
+            'domain': ('django.db.models.fields.CharField', [], {'max_length': '255', 'unique': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'public_register': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'scheme': ('django.db.models.fields.CharField', [], {'max_length': '60', 'default': 'None', 'null': 'True'})
+        },
+        'contenttypes.contenttype': {
+            'Meta': {'object_name': 'ContentType', 'unique_together': "(('app_label', 'model'),)", 'ordering': "('name',)", 'db_table': "'django_content_type'"},
+            'app_label': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'model': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '100'})
+        },
+        'projects.attachment': {
+            'Meta': {'object_name': 'Attachment', 'ordering': "['project', 'created_date']"},
+            'attached_file': ('django.db.models.fields.files.FileField', [], {'max_length': '500', 'blank': 'True', 'null': 'True'}),
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['contenttypes.ContentType']"}),
+            'created_date': ('django.db.models.fields.DateTimeField', [], {'blank': 'True', 'auto_now_add': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'modified_date': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'}),
+            'object_id': ('django.db.models.fields.PositiveIntegerField', [], {}),
+            'owner': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'change_attachments'", 'to': "orm['users.User']"}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'attachments'", 'to': "orm['projects.Project']"})
+        },
+        'projects.issuestatus': {
+            'Meta': {'object_name': 'IssueStatus', 'unique_together': "(('project', 'name'),)", 'ordering': "['project', 'order', 'name']"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_closed': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'issue_statuses'", 'to': "orm['projects.Project']"})
+        },
+        'projects.issuetype': {
+            'Meta': {'object_name': 'IssueType', 'unique_together': "(('project', 'name'),)", 'ordering': "['project', 'order', 'name']"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'issue_types'", 'to': "orm['projects.Project']"})
+        },
+        'projects.membership': {
+            'Meta': {'object_name': 'Membership', 'ordering': "['project', 'role']"},
+            'created_at': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now', 'blank': 'True', 'auto_now_add': 'True'}),
+            'email': ('django.db.models.fields.EmailField', [], {'max_length': '255', 'default': 'None', 'null': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'memberships'", 'to': "orm['projects.Project']"}),
+            'role': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'memberships'", 'to': "orm['users.Role']"}),
+            'token': ('django.db.models.fields.CharField', [], {'max_length': '60', 'unique': 'True', 'default': 'None', 'null': 'True', 'blank': 'True'}),
+            'user': ('django.db.models.fields.related.ForeignKey', [], {'blank': 'True', 'related_name': "'memberships'", 'default': 'None', 'null': 'True', 'to': "orm['users.User']"})
+        },
+        'projects.points': {
+            'Meta': {'object_name': 'Points', 'unique_together': "(('project', 'name'),)", 'ordering': "['project', 'order', 'name']"},
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'points'", 'to': "orm['projects.Project']"}),
+            'value': ('django.db.models.fields.FloatField', [], {'blank': 'True', 'default': 'None', 'null': 'True'})
+        },
+        'projects.priority': {
+            'Meta': {'object_name': 'Priority', 'unique_together': "(('project', 'name'),)", 'ordering': "['project', 'order', 'name']"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'priorities'", 'to': "orm['projects.Project']"})
+        },
+        'projects.project': {
+            'Meta': {'object_name': 'Project', 'ordering': "['name']"},
+            'created_date': ('django.db.models.fields.DateTimeField', [], {'blank': 'True', 'auto_now_add': 'True'}),
+            'default_issue_status': ('django.db.models.fields.related.OneToOneField', [], {'on_delete': 'models.SET_NULL', 'unique': 'True', 'null': 'True', 'related_name': "'+'", 'blank': 'True', 'to': "orm['projects.IssueStatus']"}),
+            'default_issue_type': ('django.db.models.fields.related.OneToOneField', [], {'on_delete': 'models.SET_NULL', 'unique': 'True', 'null': 'True', 'related_name': "'+'", 'blank': 'True', 'to': "orm['projects.IssueType']"}),
+            'default_points': ('django.db.models.fields.related.OneToOneField', [], {'on_delete': 'models.SET_NULL', 'unique': 'True', 'null': 'True', 'related_name': "'+'", 'blank': 'True', 'to': "orm['projects.Points']"}),
+            'default_priority': ('django.db.models.fields.related.OneToOneField', [], {'on_delete': 'models.SET_NULL', 'unique': 'True', 'null': 'True', 'related_name': "'+'", 'blank': 'True', 'to': "orm['projects.Priority']"}),
+            'default_question_status': ('django.db.models.fields.related.OneToOneField', [], {'on_delete': 'models.SET_NULL', 'unique': 'True', 'null': 'True', 'related_name': "'+'", 'blank': 'True', 'to': "orm['projects.QuestionStatus']"}),
+            'default_severity': ('django.db.models.fields.related.OneToOneField', [], {'on_delete': 'models.SET_NULL', 'unique': 'True', 'null': 'True', 'related_name': "'+'", 'blank': 'True', 'to': "orm['projects.Severity']"}),
+            'default_task_status': ('django.db.models.fields.related.OneToOneField', [], {'on_delete': 'models.SET_NULL', 'unique': 'True', 'null': 'True', 'related_name': "'+'", 'blank': 'True', 'to': "orm['projects.TaskStatus']"}),
+            'default_us_status': ('django.db.models.fields.related.OneToOneField', [], {'on_delete': 'models.SET_NULL', 'unique': 'True', 'null': 'True', 'related_name': "'+'", 'blank': 'True', 'to': "orm['projects.UserStoryStatus']"}),
+            'description': ('django.db.models.fields.TextField', [], {}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'last_issue_ref': ('django.db.models.fields.BigIntegerField', [], {'default': '1', 'null': 'True'}),
+            'last_task_ref': ('django.db.models.fields.BigIntegerField', [], {'default': '1', 'null': 'True'}),
+            'last_us_ref': ('django.db.models.fields.BigIntegerField', [], {'default': '1', 'null': 'True'}),
+            'members': ('django.db.models.fields.related.ManyToManyField', [], {'related_name': "'projects'", 'symmetrical': 'False', 'to': "orm['users.User']", 'through': "orm['projects.Membership']"}),
+            'modified_date': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '250', 'unique': 'True'}),
+            'owner': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'owned_projects'", 'to': "orm['users.User']"}),
+            'public': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'site': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'projects'", 'default': 'None', 'null': 'True', 'to': "orm['base.Site']"}),
+            'slug': ('django.db.models.fields.SlugField', [], {'max_length': '250', 'unique': 'True', 'blank': 'True'}),
+            'tags': ('picklefield.fields.PickledObjectField', [], {'blank': 'True'}),
+            'total_milestones': ('django.db.models.fields.IntegerField', [], {'blank': 'True', 'default': '0', 'null': 'True'}),
+            'total_story_points': ('django.db.models.fields.FloatField', [], {'default': 'None', 'null': 'True'})
+        },
+        'projects.questionstatus': {
+            'Meta': {'object_name': 'QuestionStatus', 'unique_together': "(('project', 'name'),)", 'ordering': "['project', 'order', 'name']"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_closed': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'question_status'", 'to': "orm['projects.Project']"})
+        },
+        'projects.severity': {
+            'Meta': {'object_name': 'Severity', 'unique_together': "(('project', 'name'),)", 'ordering': "['project', 'order', 'name']"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'severities'", 'to': "orm['projects.Project']"})
+        },
+        'projects.taskstatus': {
+            'Meta': {'object_name': 'TaskStatus', 'unique_together': "(('project', 'name'),)", 'ordering': "['project', 'order', 'name']"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "'#999999'"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_closed': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'task_statuses'", 'to': "orm['projects.Project']"})
+        },
+        'projects.userstorystatus': {
+            'Meta': {'object_name': 'UserStoryStatus', 'unique_together': "(('project', 'name'),)", 'ordering': "['project', 'order', 'name']"},
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_closed': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'project': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'us_statuses'", 'to': "orm['projects.Project']"})
+        },
+        'users.role': {
+            'Meta': {'object_name': 'Role', 'ordering': "['order', 'slug']"},
+            'computable': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '200'}),
+            'order': ('django.db.models.fields.IntegerField', [], {'default': '10'}),
+            'permissions': ('django.db.models.fields.related.ManyToManyField', [], {'related_name': "'roles'", 'symmetrical': 'False', 'to': "orm['auth.Permission']"}),
+            'slug': ('django.db.models.fields.SlugField', [], {'max_length': '250', 'unique': 'True', 'blank': 'True'})
+        },
+        'users.user': {
+            'Meta': {'object_name': 'User', 'ordering': "['username']"},
+            'color': ('django.db.models.fields.CharField', [], {'max_length': '9', 'default': "'#669933'", 'blank': 'True'}),
+            'colorize_tags': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'date_joined': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'default_language': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "''", 'blank': 'True'}),
+            'default_timezone': ('django.db.models.fields.CharField', [], {'max_length': '20', 'default': "''", 'blank': 'True'}),
+            'description': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'email': ('django.db.models.fields.EmailField', [], {'max_length': '75', 'blank': 'True'}),
+            'first_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
+            'groups': ('django.db.models.fields.related.ManyToManyField', [], {'related_name': "'user_set'", 'blank': 'True', 'symmetrical': 'False', 'to': "orm['auth.Group']"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_active': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'is_staff': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'is_superuser': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'last_login': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'last_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
+            'notify_changes_by_me': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'notify_level': ('django.db.models.fields.CharField', [], {'max_length': '32', 'default': "'all_owned_projects'"}),
+            'password': ('django.db.models.fields.CharField', [], {'max_length': '128'}),
+            'photo': ('django.db.models.fields.files.FileField', [], {'max_length': '500', 'blank': 'True', 'null': 'True'}),
+            'token': ('django.db.models.fields.CharField', [], {'max_length': '200', 'blank': 'True', 'default': 'None', 'null': 'True'}),
+            'user_permissions': ('django.db.models.fields.related.ManyToManyField', [], {'related_name': "'user_set'", 'blank': 'True', 'symmetrical': 'False', 'to': "orm['auth.Permission']"}),
+            'username': ('django.db.models.fields.CharField', [], {'max_length': '30', 'unique': 'True'})
+        }
+    }
+
+    complete_apps = ['projects']
+    symmetrical = True
diff --git a/greenmine/projects/models.py b/greenmine/projects/models.py
index 7459733b..8c30fead 100644
--- a/greenmine/projects/models.py
+++ b/greenmine/projects/models.py
@@ -1,5 +1,8 @@
 # -*- coding: utf-8 -*-
 
+import itertools
+import collections
+
 from django.db import models
 from django.db.models.loading import get_model
 from django.conf import settings
@@ -8,104 +11,47 @@ from django.contrib.contenttypes.models import ContentType
 from django.contrib.contenttypes import generic
 from django.contrib.auth import get_user_model
 from django.utils.translation import ugettext_lazy as _
+from django.utils import timezone
 
 from picklefield.fields import PickledObjectField
+import reversion
+
 
 from greenmine.base.utils.slug import slugify_uniquely
 from greenmine.base.utils.dicts import dict_sum
 from greenmine.projects.userstories.models import UserStory
 from . import choices
 
-import reversion
-import itertools
-import collections
-
-
-def get_attachment_file_path(instance, filename):
-    return "attachment-files/{project}/{model}/{filename}".format(
-        project=instance.project.slug,
-        model=instance.content_type.model,
-        filename=filename
-    )
-
-
-class Attachment(models.Model):
-    owner = models.ForeignKey(settings.AUTH_USER_MODEL, null=False, blank=False,
-                              related_name="change_attachments",
-                              verbose_name=_("owner"))
-    project = models.ForeignKey("Project", null=False, blank=False,
-                                related_name="attachments", verbose_name=_("project"))
-    content_type = models.ForeignKey(ContentType, null=False, blank=False,
-                                     verbose_name=_("content type"))
-    object_id = models.PositiveIntegerField(null=False, blank=False,
-                                            verbose_name=_("object id"))
-    content_object = generic.GenericForeignKey("content_type", "object_id")
-    created_date = models.DateTimeField(auto_now_add=True, null=False, blank=False,
-                                        verbose_name=_("created date"))
-    modified_date = models.DateTimeField(auto_now=True, null=False, blank=False,
-                                         verbose_name=_("modified date"))
-    attached_file = models.FileField(max_length=500, null=True, blank=True,
-                                     upload_to=get_attachment_file_path,
-                                     verbose_name=_("attached file"))
-
-    class Meta:
-        verbose_name = "attachment"
-        verbose_name_plural = "attachments"
-        ordering = ["project", "created_date"]
-        permissions = (
-            ("view_attachment", "Can view attachment"),
-        )
-
-    def __str__(self):
-        return "Attachment: {}".format(self.id)
-
 
 class Membership(models.Model):
-    user = models.ForeignKey(settings.AUTH_USER_MODEL, null=False, blank=False,
+    # This model stores all project memberships. Also
+    # stores invitations to memberships that does not have
+    # assigned user.
+
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, null=True, blank=True, default=None,
                              related_name="memberships")
     project = models.ForeignKey("Project", null=False, blank=False,
                                 related_name="memberships")
     role = models.ForeignKey("users.Role", null=False, blank=False,
                              related_name="memberships")
 
+    # Invitation metadata
+    email = models.EmailField(max_length=255, default=None, null=True)
+    created_at = models.DateTimeField(auto_now_add=True, default=timezone.now)
+    token = models.CharField(max_length=60, unique=True, blank=True, null=True,
+                             default=None)
+
     class Meta:
         verbose_name = "membership"
         verbose_name_plural = "membershipss"
-        unique_together = ("user", "project")
-        ordering = ["project", "role", "user"]
+        ordering = ["project", "role"]
         permissions = (
             ("view_membership", "Can view membership"),
         )
 
 
-class Project(models.Model):
-    name = models.CharField(max_length=250, unique=True, null=False, blank=False,
-                            verbose_name=_("name"))
-    slug = models.SlugField(max_length=250, unique=True, null=False, blank=True,
-                            verbose_name=_("slug"))
-    description = models.TextField(null=False, blank=False,
-                                   verbose_name=_("description"))
-    created_date = models.DateTimeField(auto_now_add=True, null=False, blank=False,
-                                        verbose_name=_("created date"))
-    modified_date = models.DateTimeField(auto_now=True, null=False, blank=False,
-                                         verbose_name=_("modified date"))
-    owner = models.ForeignKey(settings.AUTH_USER_MODEL, null=False, blank=False,
-                              related_name="owned_projects", verbose_name=_("owner"))
-    members = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name="projects",
-                                     through="Membership", verbose_name=_("members"))
-    public = models.BooleanField(default=True, null=False, blank=True,
-                                 verbose_name=_("public"))
-    last_us_ref = models.BigIntegerField(null=True, blank=False, default=1,
-                                         verbose_name=_("last us ref"))
-    last_task_ref = models.BigIntegerField(null=True, blank=False, default=1,
-                                           verbose_name=_("last task ref"))
-    last_issue_ref = models.BigIntegerField(null=True, blank=False, default=1,
-                                            verbose_name=_("last issue ref"))
-    total_milestones = models.IntegerField(default=0, null=True, blank=True,
-                                           verbose_name=_("total of milestones"))
-    total_story_points = models.FloatField(default=None, null=True, blank=False,
-                                           verbose_name=_("total story points"))
-    tags = PickledObjectField(null=False, blank=True, verbose_name=_("tags"))
+
+class ProjectDefaults(models.Model):
     default_points = models.OneToOneField("projects.Points", on_delete=models.SET_NULL,
                                           related_name="+", null=True, blank=True,
                                           verbose_name=_("default points"))
@@ -136,19 +82,53 @@ class Project(models.Model):
                                                    related_name="+", null=True, blank=True,
                                                    verbose_name=_("default questions "
                                                                   "status"))
+    class Meta:
+        abstract = True
+
+
+class Project(ProjectDefaults, models.Model):
+    name = models.CharField(max_length=250, unique=True, null=False, blank=False,
+                            verbose_name=_("name"))
+    slug = models.SlugField(max_length=250, unique=True, null=False, blank=True,
+                            verbose_name=_("slug"))
+    description = models.TextField(null=False, blank=False,
+                                   verbose_name=_("description"))
+    created_date = models.DateTimeField(auto_now_add=True, null=False, blank=False,
+                                        verbose_name=_("created date"))
+    modified_date = models.DateTimeField(auto_now=True, null=False, blank=False,
+                                         verbose_name=_("modified date"))
+    owner = models.ForeignKey(settings.AUTH_USER_MODEL, null=False, blank=False,
+                              related_name="owned_projects", verbose_name=_("owner"))
+    members = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name="projects",
+                                     through="Membership", verbose_name=_("members"))
+    public = models.BooleanField(default=True, null=False, blank=True,
+                                 verbose_name=_("public"))
+    last_us_ref = models.BigIntegerField(null=True, blank=False, default=1,
+                                         verbose_name=_("last us ref"))
+    last_task_ref = models.BigIntegerField(null=True, blank=False, default=1,
+                                           verbose_name=_("last task ref"))
+    last_issue_ref = models.BigIntegerField(null=True, blank=False, default=1,
+                                            verbose_name=_("last issue ref"))
+    total_milestones = models.IntegerField(default=0, null=True, blank=True,
+                                           verbose_name=_("total of milestones"))
+    total_story_points = models.FloatField(default=None, null=True, blank=False,
+                                           verbose_name=_("total story points"))
+    tags = PickledObjectField(null=False, blank=True, verbose_name=_("tags"))
+    site = models.ForeignKey("base.Site", related_name="projects", null=True, default=None)
 
     notifiable_fields = [
         "name",
         "total_milestones",
         "total_story_points",
-        "default_points",
-        "default_us_status",
-        "default_task_status",
-        "default_priority",
-        "default_severity",
-        "default_issue_status",
-        "default_issue_type",
-        "default_question_status",
+        # This realy should be in this list?
+        # "default_points",
+        # "default_us_status",
+        # "default_task_status",
+        # "default_priority",
+        # "default_severity",
+        # "default_issue_status",
+        # "default_issue_type",
+        # "default_question_status",
         "description"
     ]
 
@@ -178,9 +158,8 @@ class Project(models.Model):
 
     def get_users(self):
         user_model = get_user_model()
-        return user_model.objects.filter(
-            id__in=list(self.memberships.values_list("user", flat=True))
-        )
+        members = self.memberships.values_list("user", flat=True)
+        return user_model.objects.filter(id__in=list(members))
 
     def update_role_points(self):
         rolepoints_model = get_model("userstories", "RolePoints")
@@ -251,6 +230,45 @@ class Project(models.Model):
         return self._get_user_stories_points(self.user_stories.filter(milestone__isnull=False))
 
 
+def get_attachment_file_path(instance, filename):
+    return "attachment-files/{project}/{model}/{filename}".format(
+        project=instance.project.slug,
+        model=instance.content_type.model,
+        filename=filename
+    )
+
+
+class Attachment(models.Model):
+    owner = models.ForeignKey(settings.AUTH_USER_MODEL, null=False, blank=False,
+                              related_name="change_attachments",
+                              verbose_name=_("owner"))
+    project = models.ForeignKey("Project", null=False, blank=False,
+                                related_name="attachments", verbose_name=_("project"))
+    content_type = models.ForeignKey(ContentType, null=False, blank=False,
+                                     verbose_name=_("content type"))
+    object_id = models.PositiveIntegerField(null=False, blank=False,
+                                            verbose_name=_("object id"))
+    content_object = generic.GenericForeignKey("content_type", "object_id")
+    created_date = models.DateTimeField(auto_now_add=True, null=False, blank=False,
+                                        verbose_name=_("created date"))
+    modified_date = models.DateTimeField(auto_now=True, null=False, blank=False,
+                                         verbose_name=_("modified date"))
+    attached_file = models.FileField(max_length=500, null=True, blank=True,
+                                     upload_to=get_attachment_file_path,
+                                     verbose_name=_("attached file"))
+
+    class Meta:
+        verbose_name = "attachment"
+        verbose_name_plural = "attachments"
+        ordering = ["project", "created_date"]
+        permissions = (
+            ("view_attachment", "Can view attachment"),
+        )
+
+    def __str__(self):
+        return "Attachment: {}".format(self.id)
+
+
 # User Stories common Models
 class UserStoryStatus(models.Model):
     name = models.CharField(max_length=255, null=False, blank=False,
diff --git a/greenmine/projects/serializers.py b/greenmine/projects/serializers.py
index 3f727d3c..3ffe8888 100644
--- a/greenmine/projects/serializers.py
+++ b/greenmine/projects/serializers.py
@@ -89,6 +89,12 @@ class QuestionStatusSerializer(serializers.ModelSerializer):
 # Projects
 
 class MembershipSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = models.Membership
+        read_only_fields = ("user",)
+
+
+class ProjectMembershipSerializer(serializers.ModelSerializer):
     role_name = serializers.CharField(source='role.name', required=False)
     full_name = serializers.CharField(source='user.get_full_name', required=False)
 
@@ -101,14 +107,14 @@ class ProjectSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = models.Project
-        read_only_fields = ("created_date", "modified_date", "owner")
+        read_only_fields = ("created_date", "modified_date", "owner", "site")
         exclude = ("last_us_ref", "last_task_ref", "last_issue_ref")
 
 
 class ProjectDetailSerializer(ProjectSerializer):
     list_of_milestones = serializers.SerializerMethodField("get_list_of_milestones")
     roles = serializers.SerializerMethodField("get_list_of_roles")
-    memberships = MembershipSerializer(many=True, required=False)
+    memberships = ProjectMembershipSerializer(many=True, required=False)
     us_statuses = UserStoryStatusSerializer(many=True, required=False)       # User Stories
     points = PointsSerializer(many=True, required=False)
     task_statuses = TaskStatusSerializer(many=True, required=False)          # Tasks
diff --git a/greenmine/projects/templates/emails/membership_invitation-body-html.jinja b/greenmine/projects/templates/emails/membership_invitation-body-html.jinja
new file mode 100644
index 00000000..24f7d658
--- /dev/null
+++ b/greenmine/projects/templates/emails/membership_invitation-body-html.jinja
@@ -0,0 +1,23 @@
+{% extends "emails/base.jinja" %}
+
+{% set final_url = resolve_front_url("invitation", membership.token) %}
+{% set final_url_name = "Greenmine - Invitation to join on {0} project.".format(membership.project) %}
+
+{% block body %}
+<table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
+    <tr>
+        <td>
+            <p>Hi,</p>
+            <p>you have been invited to the project '{{ membership.project }}'.</p>
+            <p>If you want to join to this project go to <a href="{{ final_url }}">this link</a>
+               for accept this invitation.</p>
+        </td>
+    </tr>
+</table>
+{% endblock %}
+
+{% block footer %}
+<p style="padding: 10px; border-top: 1px solid #eee;">
+    More info at: <a href="{{ final_url }}" style="color: #666;">{{ final_url_name }}</a>
+</p>
+{% endblock %}
diff --git a/greenmine/projects/templates/emails/membership_invitation-body-text.jinja b/greenmine/projects/templates/emails/membership_invitation-body-text.jinja
new file mode 100644
index 00000000..d0cb137c
--- /dev/null
+++ b/greenmine/projects/templates/emails/membership_invitation-body-text.jinja
@@ -0,0 +1,11 @@
+{% set final_url = resolve_front_url("invitation", membership.token) %}
+{% set final_url_name = "Greenmine - Invitation to join on {0} project.".format(membership.project) %}
+
+Hi,
+
+you have been invited to the project '{{ membership.project }}'.
+
+If you want to join to this project go to {{ final_url }} for accept this invitation.
+
+
+** More info at ({{ final_url }}) **
diff --git a/greenmine/projects/templates/emails/membership_invitation-subject.jinja b/greenmine/projects/templates/emails/membership_invitation-subject.jinja
new file mode 100644
index 00000000..3d46285c
--- /dev/null
+++ b/greenmine/projects/templates/emails/membership_invitation-subject.jinja
@@ -0,0 +1 @@
+[Greenmine] Invitation to join to the project '{{ membership.project}}'
diff --git a/greenmine/projects/tests/__init__.py b/greenmine/projects/tests/__init__.py
index 66171fe1..c73028c1 100644
--- a/greenmine/projects/tests/__init__.py
+++ b/greenmine/projects/tests/__init__.py
@@ -20,8 +20,7 @@ def create_project(id, owner, save=True):
 
 def add_membership(project, user, role_slug=None):
     model = get_model("users", "Role")
-    roles = model.objects.filter(slug=role_slug)
-    role = roles[0] if roles.exists() else model.objects.all()[0]
+    role = model.objects.get(slug=role_slug)
 
     model = get_model("projects", "Membership")
     instance = model.objects.create(
diff --git a/greenmine/projects/tests/tests_api.py b/greenmine/projects/tests/tests_api.py
index fc10000d..037f27ec 100644
--- a/greenmine/projects/tests/tests_api.py
+++ b/greenmine/projects/tests/tests_api.py
@@ -8,12 +8,12 @@ from django.core import mail
 from django.db.models import get_model
 
 from greenmine.base.users.tests import create_user
-from greenmine.projects.models import Project
+from greenmine.projects.models import Project, Membership
 
 from . import create_project, add_membership
 
 class ProfileTestCase(test.TestCase):
-    fixtures = ["initial_role.json", ]
+    fixtures = ["initial_role.json", "initial_site.json"]
 
     def setUp(self):
         self.user1 = create_user(1, is_superuser=True)
@@ -24,9 +24,10 @@ class ProfileTestCase(test.TestCase):
         self.project2 = create_project(2, self.user1)
         self.project3 = create_project(3, self.user2)
 
-        add_membership(self.project1, self.user3, "dev")
-        add_membership(self.project3, self.user3, "dev")
-        add_membership(self.project3, self.user2, "dev")
+        add_membership(self.project1, self.user3, "back")
+        add_membership(self.project3, self.user3, "back")
+        add_membership(self.project3, self.user2, "back")
+
 
     def test_list_users(self):
         response = self.client.login(username=self.user3.username,
@@ -37,7 +38,7 @@ class ProfileTestCase(test.TestCase):
         self.assertEqual(response.status_code, 200)
 
         users_list = response.data
-        self.assertEqual(len(users_list), 2)
+        self.assertEqual(len(users_list), 3)
 
 
     def test_update_users(self):
@@ -153,19 +154,79 @@ class ProfileTestCase(test.TestCase):
 
 
 class ProjectsTestCase(test.TestCase):
-    fixtures = ["initial_role.json", ]
+    fixtures = ["initial_role.json", "initial_site.json"]
 
     def setUp(self):
         self.user1 = create_user(1)
         self.user2 = create_user(2)
         self.user3 = create_user(3)
+        self.user3 = create_user(4)
 
         self.project1 = create_project(1, self.user1)
         self.project2 = create_project(2, self.user1)
         self.project3 = create_project(3, self.user2)
+        self.project4 = create_project(4, self.user2)
 
-        add_membership(self.project1, self.user3, "dev")
-        add_membership(self.project3, self.user3, "dev")
+        add_membership(self.project1, self.user3, "back")
+        add_membership(self.project3, self.user3, "back")
+
+        self.dev_role = get_model("users", "Role").objects.get(slug="back")
+
+    def test_send_invitations_01(self):
+        response = self.client.login(username=self.user1.username,
+                                     password=self.user1.username)
+        self.assertTrue(response)
+
+        url = reverse("memberships-list")
+        data = {"role": self.dev_role.id,
+                "email": "pepe@pepe.com",
+                "project": self.project4.id}
+
+        response = self.client.post(url, data=json.dumps(data), content_type="application/json")
+        self.assertEqual(response.status_code, 201)
+        self.assertEqual(self.project4.memberships.count(), 1)
+
+        self.assertEqual(len(mail.outbox), 1)
+        self.assertNotEqual(len(mail.outbox[0].body), 0)
+
+    def test_send_invitations_02(self):
+        response = self.client.login(username=self.user1.username,
+                                     password=self.user1.username)
+        self.assertTrue(response)
+
+        url = reverse("memberships-list")
+        data = {"role": self.dev_role.id,
+                "email": "pepe@pepe.com",
+                "project": self.project4.id}
+
+        response = self.client.post(url, data=json.dumps(data), content_type="application/json")
+
+        self.assertEqual(response.status_code, 201)
+        self.assertEqual(self.project4.memberships.count(), 1)
+        self.assertEqual(len(mail.outbox), 1)
+        self.assertNotEqual(len(mail.outbox[0].body), 0)
+
+        response = self.client.post(url, data=json.dumps(data), content_type="application/json")
+
+        self.assertEqual(self.project4.memberships.count(), 1)
+        self.assertEqual(response.status_code, 400)
+        self.assertEqual(len(mail.outbox), 1)
+        self.assertNotEqual(len(mail.outbox[0].body), 0)
+
+    def test_send_invitations_03(self):
+        response = self.client.login(username=self.user1.username,
+                                     password=self.user1.username)
+        self.assertTrue(response)
+
+        url = reverse("memberships-list")
+        data = {"role": self.dev_role.id,
+                "email": self.user3.email,
+                "project": self.project3.id}
+
+        response = self.client.post(url, data=json.dumps(data), content_type="application/json")
+        self.assertEqual(response.status_code, 400)
+
+        self.assertEqual(len(mail.outbox), 0)
 
     def test_list_projects_by_anon(self):
         response = self.client.get(reverse("projects-list"))
@@ -187,7 +248,7 @@ class ProjectsTestCase(test.TestCase):
         response = self.client.get(reverse("projects-list"))
         self.assertEqual(response.status_code, 200)
         projects_list = response.data
-        self.assertEqual(len(projects_list), 1)
+        self.assertEqual(len(projects_list), 2)
         self.client.logout()
 
     def test_list_projects_by_membership(self):
@@ -239,13 +300,13 @@ class ProjectsTestCase(test.TestCase):
             "total_story_points": 10
         }
 
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         response = self.client.post(
             reverse("projects-list"),
             json.dumps(data),
             content_type="application/json")
         self.assertEqual(response.status_code, 401)
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
 
     def test_create_project_by_auth(self):
         data = {
@@ -254,16 +315,15 @@ class ProjectsTestCase(test.TestCase):
             "total_story_points": 10
         }
 
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         response = self.client.login(username=self.user1.username,
                                      password=self.user1.username)
         self.assertTrue(response)
-        response = self.client.post(
-            reverse("projects-list"),
-            json.dumps(data),
-            content_type="application/json")
+        response = self.client.post(reverse("projects-list"), json.dumps(data),
+                                    content_type="application/json")
+
         self.assertEqual(response.status_code, 201)
-        self.assertEqual(Project.objects.all().count(), 4)
+        self.assertEqual(Project.objects.all().count(), 5)
         self.client.logout()
 
     def test_edit_project_by_anon(self):
@@ -271,21 +331,21 @@ class ProjectsTestCase(test.TestCase):
             "description": "Edited project description",
         }
 
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         self.assertNotEqual(data["description"], self.project1.description)
         response = self.client.patch(
             reverse("projects-detail", args=(self.project1.id,)),
             json.dumps(data),
             content_type="application/json")
         self.assertEqual(response.status_code, 401)
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
 
     def test_edit_project_by_owner(self):
         data = {
             "description": "Modified project description",
         }
 
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         self.assertNotEqual(data["description"], self.project1.description)
         response = self.client.login(username=self.user1.username,
                                      password=self.user1.username)
@@ -296,7 +356,7 @@ class ProjectsTestCase(test.TestCase):
             content_type="application/json")
         self.assertEqual(response.status_code, 200)
         self.assertEqual(data["description"], response.data["description"])
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         self.client.logout()
 
     def test_edit_project_by_membership(self):
@@ -304,7 +364,7 @@ class ProjectsTestCase(test.TestCase):
             "description": "Edited project description",
         }
 
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         self.assertNotEqual(data["description"], self.project1.description)
         response = self.client.login(username=self.user3.username,
                                      password=self.user3.username)
@@ -315,7 +375,7 @@ class ProjectsTestCase(test.TestCase):
             content_type="application/json")
         self.assertEqual(response.status_code, 200)
         self.assertEqual(data["description"], response.data["description"])
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         self.client.logout()
 
     def test_edit_project_by_not_membership(self):
@@ -323,7 +383,7 @@ class ProjectsTestCase(test.TestCase):
             "description": "Edited project description",
         }
 
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         self.assertNotEqual(data["description"], self.project1.description)
         response = self.client.login(username=self.user2.username,
                                      password=self.user2.username)
@@ -333,41 +393,41 @@ class ProjectsTestCase(test.TestCase):
             json.dumps(data),
             content_type="application/json")
         self.assertEqual(response.status_code, 404)
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         self.client.logout()
 
     def test_delete_project_by_anon(self):
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         response = self.client.delete(reverse("projects-detail", args=(self.project1.id,)))
         self.assertEqual(response.status_code, 401)
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
 
     def test_delete_project_by_owner(self):
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         response = self.client.login(username=self.user1.username,
                                      password=self.user1.username)
         self.assertTrue(response)
         response = self.client.delete(reverse("projects-detail", args=(self.project1.id,)))
         self.assertEqual(response.status_code, 204)
-        self.assertEqual(Project.objects.all().count(), 2)
+        self.assertEqual(Project.objects.all().count(), 3)
         self.client.logout()
 
     def test_delete_project_by_membership(self):
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         response = self.client.login(username=self.user3.username,
                                      password=self.user3.username)
         self.assertTrue(response)
         response = self.client.delete(reverse("projects-detail", args=(self.project1.id,)))
         self.assertEqual(response.status_code, 204)
-        self.assertEqual(Project.objects.all().count(), 2)
+        self.assertEqual(Project.objects.all().count(), 3)
         self.client.logout()
 
     def test_delete_project_by_not_membership(self):
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         response = self.client.login(username=self.user1.username,
                                      password=self.user1.username)
         self.assertTrue(response)
         response = self.client.delete(reverse("projects-detail", args=(self.project3.id,)))
         self.assertEqual(response.status_code, 404)
-        self.assertEqual(Project.objects.all().count(), 3)
+        self.assertEqual(Project.objects.all().count(), 4)
         self.client.logout()
diff --git a/greenmine/routers.py b/greenmine/routers.py
index 6ccb79a5..1a2fb930 100644
--- a/greenmine/routers.py
+++ b/greenmine/routers.py
@@ -4,7 +4,7 @@ from greenmine.base import routers
 from greenmine.base.auth.api import AuthViewSet
 from greenmine.base.users.api import RolesViewSet, UsersViewSet
 from greenmine.base.searches.api import SearchViewSet
-from greenmine.projects.api import ProjectViewSet, MembershipViewSet
+from greenmine.projects.api import ProjectViewSet, MembershipViewSet, InvitationViewSet
 from greenmine.projects.milestones.api import MilestoneViewSet
 from greenmine.projects.userstories.api import UserStoryViewSet, UserStoryAttachmentViewSet
 from greenmine.projects.tasks.api import  TaskViewSet, TaskAttachmentViewSet
@@ -27,6 +27,7 @@ router.register(r"search", SearchViewSet, base_name="search")
 # greenmine.projects
 router.register(r"projects", ProjectViewSet, base_name="projects")
 router.register(r"memberships", MembershipViewSet, base_name="memberships")
+router.register(r"invitations", InvitationViewSet, base_name="invitations")
 
 # greenmine.projects.milestones
 router.register(r"milestones", MilestoneViewSet, base_name="milestones")
diff --git a/greenmine/settings/common.py b/greenmine/settings/common.py
index 9964f2ac..aee008b3 100644
--- a/greenmine/settings/common.py
+++ b/greenmine/settings/common.py
@@ -15,6 +15,8 @@ OUT_PROJECT_ROOT = os.path.abspath(
     os.path.join(PROJECT_ROOT, "..")
 )
 
+USE_X_FORWARDED_HOST = True
+
 APPEND_SLASH = False
 
 
@@ -151,17 +153,17 @@ TEMPLATE_LOADERS = [
 ]
 
 MIDDLEWARE_CLASSES = [
+    'greenmine.base.middleware.CoorsMiddleware',
+    'greenmine.base.middleware.SitesMiddleware',
+
     # Common middlewares
     'django.middleware.common.CommonMiddleware',
     'django.middleware.locale.LocaleMiddleware',
-    'greenmine.base.middleware.CoorsMiddleware',
 
     # Only needed by django admin
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
-
-    # 'greenmine.base.middleware.GreenmineSessionMiddleware',
 ]
 
 TEMPLATE_CONTEXT_PROCESSORS = [
@@ -182,9 +184,6 @@ TEMPLATE_DIRS = [
 ]
 
 INSTALLED_APPS = [
-    # 'grappelli.dashboard',
-    # 'grappelli',
-
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',
@@ -192,10 +191,10 @@ INSTALLED_APPS = [
     'django.contrib.admin',
     'django.contrib.staticfiles',
 
-    'greenmine.base',
-    'greenmine.base.notifications',
     'greenmine.base.users',
+    'greenmine.base.notifications',
     'greenmine.base.searches',
+    'greenmine.base',
     'greenmine.projects',
     'greenmine.projects.milestones',
     'greenmine.projects.userstories',
@@ -210,7 +209,6 @@ INSTALLED_APPS = [
     'reversion',
     'rest_framework',
     'djmail',
-    'django_sites',
 ]
 
 WSGI_APPLICATION = 'greenmine.wsgi.application'
@@ -224,9 +222,12 @@ LOGGING = {
         }
     },
     'formatters': {
-        'simple': {
+        'complete': {
             'format': '%(levelname)s:%(asctime)s:%(module)s %(message)s'
         },
+        'simple': {
+            'format': '%(levelname)s:%(asctime)s: %(message)s'
+        },
         'null': {
             'format': '%(message)s',
         },
@@ -239,7 +240,7 @@ LOGGING = {
         'console':{
             'level':'DEBUG',
             'class':'logging.StreamHandler',
-            'formatter': 'null',
+            'formatter': 'simple',
         },
         'mail_admins': {
             'level': 'ERROR',
@@ -258,11 +259,16 @@ LOGGING = {
             'level': 'ERROR',
             'propagate': False,
         },
-        'main': {
+        'greenmine': {
             'handlers': ['console'],
             'level': 'DEBUG',
             'propagate': False,
-        }
+        },
+        'greenmine.site': {
+            'handlers': ['console'],
+            'level': 'DEBUG',
+            'propagate': False,
+        },
     }
 }
 
@@ -291,6 +297,7 @@ REST_FRAMEWORK = {
         'greenmine.base.auth.Session',
     ),
     'FILTER_BACKEND': 'greenmine.base.filters.FilterBackend',
+    'EXCEPTION_HANDLER': 'greenmine.base.exceptions.exception_handler',
     'PAGINATE_BY': 30,
     'MAX_PAGINATE_BY': 1000,
 }
diff --git a/greenmine/urls.py b/greenmine/urls.py
index beef742c..47c33fca 100644
--- a/greenmine/urls.py
+++ b/greenmine/urls.py
@@ -13,6 +13,7 @@ admin.autodiscover()
 urlpatterns = patterns('',
     url(r'^api/v1/', include(router.urls)),
     url(r'^api/v1/api-auth/', include('rest_framework.urls', namespace='rest_framework')),
+    url(r'^api/v1/sites', "greenmine.base.apiviews.sitestatus"),
     url(r'^admin/', include(admin.site.urls)),
     url(r'^grappelli/', include('grappelli.urls')),
 )
diff --git a/regenerate.sh b/regenerate.sh
index 303a4a6d..2e9e9bab 100755
--- a/regenerate.sh
+++ b/regenerate.sh
@@ -8,6 +8,8 @@ createdb greenmine
 
 echo "-> Run syncdb"
 python manage.py syncdb --migrate --noinput --traceback
+# echo "-> Load initial Site"
+# python manage.py loaddata initial_site --traceback
 echo "-> Load initial user"
 python manage.py loaddata initial_user --traceback
 echo "-> Load initial roles"
diff --git a/requirements.txt b/requirements.txt
index abc24b8c..d8222121 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ git+https://github.com/tomchristie/django-rest-framework.git@2.4.0
 git+https://github.com/etianen/django-reversion.git@django-1.6
 
 Django==1.6.0
-South==0.8.2
+South==0.8.3
 anyjson==0.3.3
 Werkzeug==0.9.4
 celery==3.0.24
@@ -19,4 +19,3 @@ djmail>=0.4
 django-jinja>=0.21
 jinja2==2.7.1
 pygments>=1.6
-django-sites>=0.4