WS: hello message and some renames
channelID register method
Updated the naming convention in mongodb
Little fix
Implemented unregister method
WS: More readable code -> Callback methods called only from one site are moved as inline methods
Added support to sent version notifications and desktop notifications
Renamed notifications payloads
No data attribute for incoming messages and if no valid UAID, a new valid one is returned instead an error
Added different response to hello package if UDP or WS protocol
WS number of process running is configurable
Inform about the number of running processes in about page
Autoclose feature
Added comments explaining each message
Merged (squashed) guillermo's branch with AS API changes: https://github.com/willyaranda/notification_server/tree/mozAPI