Updates our initial set of requirements
Ignore sublime files
First cut at adding feed/entry functionality

The models for feeds and entries are largely cribbed from Commafeed[1],
another open source feed reader.  There didn't seem much point in
reinventing this particular part of the wheel.

I'm not yet happy with the RESTful-ness of the API (I'd kind of prefer
to return a 202 Accepted, and hydrate the requested feed in the
background), but it seems silly to optimise it prematurely.  I will need
to return a better response, however, once I add tests for that.

In the meantime, the next step is some django-celery work to actually
grab feed entries in the backend.  Once that's working, I can mimic the
Fever API and tie a test instance of this to Press.