Add tracking of who sent the link

RIGS/migrations/0029_eventauthorisation_sent_by.py

@@ -0,0 +1,21 @@
+# -*- 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', '0028_migrate_purchase_order'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='eventauthorisation',
+            name='sent_by',
+            field=models.ForeignKey(default=1, to=settings.AUTH_USER_MODEL),
+            preserve_default=False,
+        ),
+    ]