Remove guardian references (old)

greenmine/scrum/admin.py

@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 from django.contrib import admin
-from guardian.admin import GuardedModelAdmin
 from greenmine.scrum import models
 import reversion
 

greenmine/settings/common.py

@@ -300,7 +300,6 @@ DATE_INPUT_FORMATS = (
 
 AUTHENTICATION_BACKENDS = (
     'django.contrib.auth.backends.ModelBackend', # default
-    'guardian.backends.ObjectPermissionBackend',
 )
 
 ANONYMOUS_USER_ID = -1