taiga: Add playbook for Taiga

The `taiga.yml` playbook deploys all the necessary components to run
*taiga-back*, *taiga-front*, and *taiga-events*.

group_vars/taiga.yml

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+taiga_branch: stable
+taiga_pip_url: http://files.pyrocufflink.blue/wheels/taiga/
+taiga_back_url: 'https://git.pyrocufflink.blue/taiga/taiga-back/archive/{{ taiga_branch }}.tar.gz'
+taiga_front_url: 'https://git.pyrocufflink.blue/taiga/taiga-front-dist/archive/{{ taiga_branch }}.tar.gz'
+taiga_events_url: 'https://git.pyrocufflink.blue/taiga/taiga-events/archive/master.tar.gz'
+taiga_back_secret_key: >-
+  =p5u`eeXx<WRLTeWvD1arsXDqIzL4v:XmbEMKWlA<M;ji1BvmuaVRdoQtW?T`G*,
+taiga_events_password: >-
+  T2EInMLa-73Thf2ATo2DJkwO6glXGBEG3M,lbFDfBUNHutvpIj8XVidGwzx87s6U
+taiga_email_host: mail.pyrocufflink.blue

taiga.yml

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+- hosts: taiga
+  roles:
+  - sudo
+  - postgresql-server
+  - rabbitmq
+- hosts: taiga
+  tasks:
+  - name: ensure postgresql server is running
+    service:
+      name=postgresql
+      state=started
+  - name: ensure rabbitmq server is running
+    service:
+      name=rabbitmq-server
+      state=started
+- hosts: taiga
+  roles:
+  - apache
+  - taiga
+- hosts: taiga
+  tasks:
+  - name: ensure taiga is running
+    service:
+      name=taiga
+      state=started
+  - name: ensure taiga-events is running
+    service:
+      name=taiga-events
+      state=started
+  - name: ensure apache is running
+    service:
+      name=httpd
+      state=started