rhbz1110627 - add REST endpoint for project config

I think that URL structure was there before I started with Zanata, but I don't think it really does anything useful.  

For this one, I would suggest simply:

    .../config

But please make sure the JavaDoc makes it clear that, for now, this just *generates* a sample config.  It doesn't return the actual "configuration for this project iteration", because we don't store that, and thus it may be missing locale mappings, command hooks, etc.