Refactor

As all points from the epic refactor issue are closed #47 (closed) I am merging this in to master in order to unblock development.

backend/core/migrations/0002_auto_20171110_1612.py

@@ -4,8 +4,8 @@ from __future__ import unicode_literals
 
 import django.contrib.auth.models
 import django.contrib.auth.validators
-from django.db import migrations, models
 import django.utils.timezone
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):