Improve documentation, add missing migrations

src/tixlbase/migrations/0015_auto_20141006_2205.py

@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tixlbase', '0014_auto_20141005_1037'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='item',
+            name='questions',
+            field=models.ManyToManyField(blank=True, related_name='items', verbose_name='Questions', help_text='The user will be asked to fill in answers for the selected questions', to='tixlbase.Question'),
+        ),
+        migrations.AlterField(
+            model_name='question',
+            name='event',
+            field=models.ForeignKey(to='tixlbase.Event', related_name='questions'),
+        ),
+    ]