Add Django REST Framework 0.4 to the respository.

We want to upgrade to DRF 2.x, and we can't have package managers install both
django-rest-framework packages cleanly, so this will allow us to keep both
installed while we phase out code dependant on the old DRF (v1 of the API).

Cloned version is git://github.com/mjumbewu/django-rest-framework-0.4.git,
shareabouts-customizations branch, commit 27a4a3ee1b.
Update the status of Django REST Framework

- Remove the special version github repo version from the requirements
- Tell Django where to find the version in the libs folder