get stun and turn credentials from server

app.js

     connection.connect(jid, document.getElementById('password').value, function (status) {
         if (status == Strophe.Status.CONNECTED) {
             console.log('connected');
+            connection.jingle.getStunAndTurnCredentials();
             if (RTC.browser == 'firefox') {
                 getUserMediaWithConstraints(['audio']);
             } else {

libs/strophejingle.bundle.js

         // validity have to be fetched before creating the peerconnection
         // TODO: implement refresh via updateIce as described in
         //      https://code.google.com/p/webrtc/issues/detail?id=1650
+        var self = this;
         this.connection.sendIQ(
             $iq({type: 'get', to: this.connection.domain})
                 .c('services', {xmlns: 'urn:xmpp:extdisco:1'}).c('service', {host: 'turn.' + this.connection.domain}),
                         break;
                     }
                 });
-                this.ice_config.iceServers = iceservers;
+                self.ice_config.iceServers = iceservers;
             },
             function (err) {
                 console.warn('getting turn credentials failed', err);