Merge pull request #102 from jitsi/fix-disableaudiolevels

Fix JitsiMeetJS option disableAudioLevels

JitsiMeetJS.js

      */
     _gumFailedHandler: [],
     init: function (options) {
-        Statistics.audioLevelsEnabled = !options.disableAudioLevels || true;
+        Statistics.audioLevelsEnabled = !options.disableAudioLevels;
 
         if (options.enableWindowOnErrorHandler) {
             // if an old handler exists also fire its events