Inconsistent requirements (setup.py vs requirements.txt)

[jimr]

The listed versions required for Django, Celery, and django-celery are all (slightly) different between the two files. Presumably setup.py is authoritative? How about fixing requirements.txt and reading it into setup.py to guarantee consistency? I'm happy to submit a PR for that if you're interested.

[matagus]

It'd be really nice. Go ahead :)