Add more missing app_labels

I don't know how I missed them. I think I must've made a mistake while
heavily rebasing this branch; it's the second time I'm surprised to not
find certain changes I'm confident I did.
Add test to check for missing app labels

This hopefully prevents me from missing more.
Different Django 1.7 commit to avoid migration issue

Django 1.7 still suffers from a range of migration problems. This one
caused migrations to be created infinitely:
https://code.djangoproject.com/ticket/23014

A commit prior to that change, but containing the fix for #23041, fixes
the issue for now.
Add set of native migrations

New style migrations created with the helper script. Now doesn't detect
any more changes after this set has been applied.
Use Django 1.7 enabled django-nose version

We'll have to run against that until django-nose gets proper 1.7
support.