* refs #1: Updated tox + travis.
* refs #1; Fixed path to register.
* refs #1: Updated urls.py
* refs #1: Added username field. Not really sure why it was needed, but whatever.
* Added an update note.
* refs #2: Updated travis.
* refs #2: Updated command to run tests.
* refs #2: Added a test showing permission_required is busted.
* refs #2: Custom user modal needs a default manager.
* refs #2: Updated settings.
* refs #2: Stop the exception from being raised.
* refs #2: Fixed a problem with named parameters.
1. All models need to be defined inside an installed application or declare an explicit app_label. Furthermore, it isn’t possible to import them before their application is loaded. In particular, it isn’t possible to import models inside the root package of an application
2. The django.contrib.contenttypes.generic module is removed
3. django.db.models.loading is removed.
