Adding JazzHub services, moving all payload processing to JazzHub

This hook will eventually replace the RationalTeamConcert service.

We've moved all the payload processing logic to our server, so all that's left is the authentication handling here.

Added doc, the config only requires userid and password.  There is an optional server_url parameter, which will only be used by us for testing.  I wasn't sure if there was a way to annotate that in the source.

We're really hoping to demo this at our user's conference in a week...