Add a small delay after the DOM is ready to start SimpleWebRTC

Seems to reduce the chance to have a permissionDeniedError on Chrome
See https://github.com/HenrikJoreteg/SimpleWebRTC/issues/127

templates/default/join.html.ep

@@ -341,6 +341,7 @@
     <script>
       var roomName = '<%= $room %>';
       $( document ).ready(function() {
+        setTimeout(function(){
           webrtc = new SimpleWebRTC({
                    url: "<%= $config->{signalingServer} %>",
                    peerConnectionConfig: {
@@ -370,6 +371,7 @@
                    }
                  });
           initVroom(roomName);
+        }, 300);
       });
     </script>
   </div>