Merge pull request #218 from jitsi/local-audio-levels-reload

Fixes local audio levels after reload.

modules/statistics/statistics.js

 
 Statistics.prototype.dispose = function () {
     if(Statistics.audioLevelsEnabled) {
-        Statistics.stopAllLocalStats();
         this.stopRemoteStats();
         if(this.eventEmitter)
             this.eventEmitter.removeAllListeners();
     }
 };
 
-Statistics.stopAllLocalStats = function () {
-    if(!Statistics.audioLevelsEnabled)
-        return;
-
-    for(var i = 0; i < this.localStats.length; i++)
-        this.localStats[i].stop();
-    this.localStats = [];
-};
-
 Statistics.stopLocalStats = function (stream) {
     if(!Statistics.audioLevelsEnabled)
         return;