Client facing authorisation procedures.

Add forms, views, templates and URLs.

Remove created at in favour of the built in versioning as that's much more accurate.
Switch to a OneToOneField with EventAuthorisation -> event as a result of this.

Move validation from models to forms where it probably belongs.
Provide more descriptive errors.

Add success page for authorisation.

RIGS/migrations/0026_remove_eventauthorisation_created_at.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('RIGS', '0025_eventauthorisation'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='eventauthorisation',
+            name='created_at',
+        ),
+    ]

RIGS/migrations/0027_eventauthorisation_event_singular.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('RIGS', '0026_remove_eventauthorisation_created_at'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='eventauthorisation',
+            name='event',
+            field=models.OneToOneField(related_name='authorisation', to='RIGS.Event'),
+        ),
+    ]