Add basic tracking of when an event authorisation request was sent.

Designed and requested by Ross because he can't remember if he's push a button...

RIGS/migrations/0030_auth_request_sending.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('RIGS', '0029_eventauthorisation_sent_by'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='event',
+            name='auth_request_at',
+            field=models.DateTimeField(null=True, blank=True),
+        ),
+        migrations.AddField(
+            model_name='event',
+            name='auth_request_by',
+            field=models.ForeignKey(blank=True, to=settings.AUTH_USER_MODEL, null=True),
+        ),
+        migrations.AddField(
+            model_name='event',
+            name='auth_request_to',
+            field=models.EmailField(max_length=254, null=True, blank=True),
+        ),
+    ]