Leaves conference when kicked.

Leaves conference when kicked, to clear listeners and timers like statistics. We need room to be non present in order to remove local tracks and avoid sending iq for track remove.

JitsiConferenceEventManager.js

 
     this.chatRoomForwarder.forward(XMPPEvents.KICKED,
         JitsiConferenceEvents.KICKED);
+    chatRoom.addListener(XMPPEvents.KICKED,
+        function () {
+            conference.room = null;
+            conference.leave.bind(conference);
+        });
 
     chatRoom.addListener(XMPPEvents.MUC_MEMBER_JOINED,
         conference.onMemberJoined.bind(conference));