Backend tests

All serialisers and views currently have 100% coverage. Closes #50 (closed). As every bit of code needs tests a general test issue is not required. Code that wants to be merged into master should be completely tested anyway.

backend/core/migrations/0003_student_matrikel_no.py

@@ -2,9 +2,10 @@
 # Generated by Django 1.11.7 on 2017-11-10 21:46
 from __future__ import unicode_literals
 
-import core.models
 from django.db import migrations, models
 
+import core.models
+
 
 class Migration(migrations.Migration):