Made pad2 server more generic and easy to implement

www/common/metadata-manager.js

@@ -72,7 +72,7 @@ define([], function () {
             },
             getMetadata: function () {
                 checkUpdate();
-                return metadataObj;
+                return Object.freeze(JSON.parse(JSON.stringify(metadataObj)));
             },
             onChange: function (f) { changeHandlers.push(f); }
         });

www/common/sframe-noscriptfix.js

@@ -1,3 +0,0 @@
-// Fix for noscript bugs when caching iframe content.
-// Caution, this file will get cached, you must change the name if you change it.
-document.getElementById('sbox-iframe').setAttribute('src', 'http://localhost:3001/pad2/inner.html?cb=' + (+new Date()));