Modules API almost finished, Build almost finished, TODO list added in README, User and Chat modules started.
Some cleanups and the updated README with the TODO list
Adding in rebar (although it was already in use), added a finalized modules template, but is not yet implemented.
Finalized Module API with a goethe_module behavior, and converted the existing modules over: core, auth, and chat.  goethe_users was renamed to goethe_auth.