Merge pull request #336 from jitsi/electron_add_tracks

fix(electron): Add/remove track handlers

modules/xmpp/JingleSessionPC.js

         return;
     }
     // Bind 'addtrack'/'removetrack' event handlers
-    if (RTCBrowserType.isChrome() || RTCBrowserType.isNWJS()) {
+    if (RTCBrowserType.isChrome() || RTCBrowserType.isNWJS()
+        || RTCBrowserType.isElectron()) {
         stream.onaddtrack = function (event) {
             self.remoteTrackAdded(event.target, event.track);
         };