JSON API for https://github.com/athanrous/suseconferenceclient

Implements the API described in Issue #10, including the 'revision' attribute for conferences (used for caching)

URL examples: 

/api/v1/conferences.json  All the conferences
/api/v1/rooms.json  All the rooms from all conferences
/api/v1/conferences/xyz/rooms.json All the rooms from the conference with guid 'xyz'
... and so on for tracks, speakers and events