Upgrade to Django 1.7

[Briehan Lombaard]

This is really for no other reason than to stick with the latest stable version and to get native support for database migrations. As far as I can tell there aren't any major compatibility issues besides maybe a few deprecation warnings which we can look into at some point.

Release notes can be found here: https://docs.djangoproject.com/en/1.7/releases/1.7/

[Briehan Lombaard]

Fixed in #ffc1bb3