feat(log): Logs server field from jwt token

app.js

     var isUIReady = APP.UI.start();
     if (isUIReady) {
         APP.conference.init({roomName: buildRoomName()}).then(function () {
+            let server = APP.tokenData.server;
+            if(server) {
+                APP.conference.logEvent("server." + server, 1);
+            }
+
             APP.UI.initConference();
 
             APP.UI.addListener(UIEvents.LANG_CHANGED, function (language) {

conference.js

             // Update the view
             APP.UI.setLocalRaisedHandStatus(raisedHand);
         }
+    },
+    /**
+     * Log event to callstats and analytics.
+     * @param {string} name the event name
+     * @param {int} value the value (it's int because google analytics supports
+     * only int).
+     * NOTE: Should be used after conference.init
+     */
+    logEvent(name, value) {
+        if(JitsiMeetJS.analytics) {
+            JitsiMeetJS.analytics.sendEvent(name, value);
+        }
+        if(room) {
+            room.sendApplicationLog(JSON.stringify({name, value}));
+        }
     }
 };

modules/TokenData/TokenData.js

         this.payload = this.decodedJWT.payload;
         if(!this.payload.context)
             return;
+        this.server = this.payload.context.server;
         let callerData = this.payload.context.user;
         let calleeData = this.payload.context.callee;
         if(callerData)