Convert docs to sphinx and put on RTFD.org

[pydanny]

Another thing that will increase usage is Sphinx for better documentation. And hosting of those docs on rtfd.org

[skoczen]

Yup. RTD is coming - I've actually got some stuff I told eric I'd work on on that project, so will probably use zebra to test out those changes.

Again, fork/pulls welcome if you want it sooner than I can get to it :)

[leetrout]

Under development in my fork in the "docs" branch. WIP at http://readthedocs.org/docs/django-zebra-doc-dev/