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/0001_initial.py

@@ -2,6 +2,8 @@
 # Generated by Django 1.11.7 on 2017-11-04 19:10
 from __future__ import unicode_literals
 
+from typing import List, Text
+
 import django.db.models.deletion
 from django.conf import settings
 from django.db import migrations, models
@@ -13,8 +15,7 @@ class Migration(migrations.Migration):
 
     initial = True
 
-    dependencies = [
-    ]
+    dependencies: List[Text] = []
 
     operations = [
         migrations.CreateModel(