refs #4 Add Chord implementation

* Started integrating Chord into the main application flow of BOPlishClient
* The fallback WebSocket channel is now passed to the Chord instance
* The 'local node' instance transparently uses the WebSocket channel for
  communication
* Added 'route' method to Chord

Other fixes:

* Fixed 'setRemoteDescription' calls which at least in Firefox need a callback
  function as parameter to succeed.
* Reactivated tests
refs #4 Add Chord implementation

* Fixed message routing
* Added error message type
* Removed unused 'to' parameter from Chord messages