Fixes issue with the download logs button.

index.html

     <script src="libs/popover.js?v=1"></script><!-- bootstrap tooltip lib -->
     <script src="libs/toastr.js?v=1"></script><!-- notifications lib -->
     <script src="interface_config.js?v=5"></script>
-    <script src="libs/app.bundle.js?v=83"></script>
+    <script src="libs/app.bundle.js?v=84"></script>
     <script src="analytics.js?v=1"></script><!-- google analytics plugin -->
     <link rel="stylesheet" href="css/font.css?v=7"/>
     <link rel="stylesheet" href="css/toastr.css?v=1">

modules/xmpp/strophe.jingle.js

          */
         populateData: function () {
             var data = {};
+            var self = this;
             Object.keys(this.sessions).forEach(function (sid) {
-                var session = this.sessions[sid];
+                var session = self.sessions[sid];
                 if (session.peerconnection && session.peerconnection.updateLog) {
                     // FIXME: should probably be a .dump call
                     data["jingle_" + session.sid] = {