Implemented Observable constructor that accepts JSON objects.

data/observable/observable.d.ts

@@ -44,6 +44,12 @@ declare module "data/observable" {
      * Observable is used when you want to be notified when a change occurs. Use on/off methods to add/remove listener.
      */
     class Observable {
+
+        /**
+         * Creates an Observable instance and sets its properties accroding to the supplied JSON object.
+         */
+        constructor(json?: any);
+
         /**
          * Gets the name of the constructor function for this instance. E.g. for a Button class this will return "Button".
          */

data/observable/observable.ts

@@ -13,6 +13,16 @@ export module knownEvents {
 export class Observable implements definition.Observable {
     private _observers = {};
 
+    constructor(json?: any) {
+        if (json) {
+            for (var prop in json) {
+                if (json.hasOwnProperty(prop)) {
+                    this.set(prop, json[prop]);
+                }
+            }
+        }
+    }
+
     get typeName(): string {
         return types.getClass(this);
     }