Add the base foundation for Djblets codebase documentation.

Review Request #7368 — Created June 2, 2015 and submitted — Latest diff uploaded

Information

Djblets
release-0.9.x
0beeef1...

Reviewers

This introduces a new set of docs for documenting all the utilities
provided by Djblets. Right now, we don't have any sort of high-level
overview, but we do have autodocs for all the modules people would want
to use.

Built the docs and looked through them. There's plenty to fix up still,
but this provides a pretty solid foundation.