Fixes issue with StatsCollector when the conference is recreated the peerconnection in the StatsCollector isn't updated.

app.js

  */
 function startRtpStatsCollector()
 {
-    if (config.enableRtpStats && !statsCollector)
+    stopRTPStatsCollector();
+    if (config.enableRtpStats)
     {
         statsCollector = new StatsCollector(
             getConferenceHandler().peerconnection, 200, statsUpdated);
         statsCollector.start();
     }
 }
+
+/**
+ * Stops the {@link StatsCollector}.
+ */
+function stopRTPStatsCollector()
+{
+    if (statsCollector)
+    {
+        statsCollector.stop();
+        statsCollector = null;
+    }
+}
+
 /**
  * Starts the {@link LocalStatsCollector} if the feature is enabled in config.js
  * @param stream the stream that will be used for collecting statistics.
         }
         handler.peerconnection.close();
     }
-    if (statsCollector)
-    {
-        statsCollector.stop();
-        statsCollector = null;
-    }
+    stopRTPStatsCollector();
     if(!onUnload) {
         startLocalRtpStatsCollector(connection.jingle.localAudio);
     }