====== onReconnecting() ======
wrtc.onReconnecting() is an event function called when a call has been interrupted and wrtc_kit will attempt to reconnect it.

For instance if an ICE failure made client loose connection wrtc_kit may try to use another ICE candidate.

You can use this event to indicate to user system is trying to regain connection.

===== Occurs =====
When connection is lost.

===== Arguments =====
wrtc.onReconnecting(obj)
  * obj - call object raising the event

===== Return value =====
Ignored.