Add: Resources observer

eustia/SafeMutationObserver.js

@@ -0,0 +1,23 @@
+/* Safe MutationObserver, does nothing if MutationObserver is not supported.
+ * 
+ * ```javascript
+ * var observer = new DomObserver(function (mutations) 
+ * {
+ *     // Do something.     
+ * });
+ * observer.observe(document.htmlElement);
+ * observer.disconnect();
+ * ```
+ */
+
+exports = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
+
+if (!exports) 
+{
+    exports = class MutationObserver {
+        constructor() {}
+        observe() {}
+        disconnect() {}
+        takeRecords() {}
+    };
+}