chore(controller): update djangorestframework to 3.0.5

[mboersma]

See http://www.django-rest-framework.org/topics/release-notes/

[carmstrong]

Code LGTM.

[bacongobbler]

Seems like there may be some more improvements which we can make in the views. We still reference self.model in a few of the views, which seems like it's more or less deprecated (we override that value though so it's all good): encode/django-rest-framework#2486

Code LGTM, just thought it'd be a good topic to bring up