feat(analytics): Add analytics permanent properties and use new paramenters format

analytics.js

     /* eslint-enable */
   }
 
-  Analytics.prototype.sendEvent = function (action, data, label, browserName) {
+  Analytics.prototype.sendEvent = function (action, data) {
     // empty label if missing value for it and add the value,
     // the value should be integer or null
-    var value = Math.round(parseFloat(data));
+    var value = data.value;
+    value = value? Math.round(parseFloat(value)) : null;
+    var label = data.label || "";
 
     ga('send', 'event', 'jit.si',
-        action + '.' + browserName, label ? label : "", value ? value : null);
-  };
-
-  Analytics.prototype.sendFeedback = function (data, label, browserName) {
-      this.sendEvent('feedback.rating', data.overall, label, browserName);
+        action + '.' + data.browserName, label, value);
   };
 
   ctx.Analytics = Analytics;

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

     }
 }
 
+/**
+ * Sends statistics from APP.tokenData
+ */
+function sendTokenDataStats() {
+    let {server, group} = APP.tokenData;
+    if(server) {
+        APP.conference.logEvent("server." + server, 1);
+    }
+    if(group) {
+        APP.conference.logEvent("group", group);
+    }
+}
+
+/**
+ * Set permanent ptoperties to analytics.
+ * NOTE: Has to be used after JitsiMeetJS.init. otherwise analytics will be
+ * null.
+ */
+function setAnalyticsPermanentProperties() {
+    let permanentProperties = {
+        userAgent: navigator.userAgent,
+        roomName: APP.conference.roomName
+    };
+    let {server, group} = APP.tokenData;
+    if(server) {
+        permanentProperties.server = server;
+    }
+    if(group) {
+        permanentProperties.group = group;
+    }
+    JitsiMeetJS.analytics.addPermanentProperties(permanentProperties);
+}
+
 export default {
     isModerator: false,
     audioMuted: false,
         }
 
         return JitsiMeetJS.init(config)
-            .then(() => createInitialLocalTracksAndConnect(options.roomName))
-            .then(([tracks, con]) => {
+            .then(() => {
+                setAnalyticsPermanentProperties();
+                sendTokenDataStats();
+                return createInitialLocalTracksAndConnect(options.roomName);
+            }).then(([tracks, con]) => {
                 console.log('initialized with %s local tracks', tracks.length);
                 APP.connection = connection = con;
                 this._createRoom(tracks);
             // Longer delays will be caused by something else and will just
             // poison the data.
             if (delay < 2000) {
-                JitsiMeetJS.analytics.sendEvent('stream.switch.delay', delay);
+                JitsiMeetJS.analytics.sendEvent('stream.switch.delay',
+                    {value: delay});
             }
         });
 
      */
     logEvent(name, value) {
         if(JitsiMeetJS.analytics) {
-            JitsiMeetJS.analytics.sendEvent(name, value);
+            JitsiMeetJS.analytics.sendEvent(name, {value});
         }
         if(room) {
             room.sendApplicationLog(JSON.stringify({name, value}));

modules/TokenData/TokenData.js

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