Added new demo states.html & updated existing demos to work on firefox.

Review URL: https://webrtc-codereview.appspot.com/1327007

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3905 4adac7df-926f-26a2-2b94-8c16560cd09d

samples/js/demos/html/pranswer.html

@@ -115,7 +115,8 @@ function stop() {
 }
 
 function gotRemoteStream(e) {
-  vid2.src = webkitURL.createObjectURL(e.stream);
+  // Call the polyfill wrapper to attach the media stream to this element.
+  attachMediaStream(vid2, e.stream);
   trace("Received remote stream");
 }