Compatible emit for ringing and addChannel

otalk#30

Author: itsazzad

index.js

@@ -82,7 +82,7 @@ Object.defineProperties(MediaSession.prototype, {
         set: function (value) {
             if (value !== this._ringing) {
                 this._ringing = value;
-                this.emit('change:ringing', value);
+                this.emit('change:ringing', this, value);
             }
         }
     },
@@ -661,7 +661,7 @@ MediaSession.prototype = extend(MediaSession.prototype, {
     // DataChannels
     // ----------------------------------------------------------------
     onAddChannel: function (channel) {
-        this.emit('addChannel', channel);
+        this.emit('addChannel', this, channel);
     }
 });