Re: everything via github api.

I still think its worth having the git provider. Reason being that it allows the system to work against any git provider rather than just github.

I think it's worth adding a github source code provider though. Added as #19.

Re: Regexes.
The user story in my mind for get_branches_involved is #22. I'm planning on changing the code here now to allow the plugin to take a ``feature_breakup`` regex and a ``branch_finder`` regex. 

Hopefully that matches what you're after too...