zip download update

Playground/zipContent/index.html

@@ -5,10 +5,10 @@
 
         <title>Babylon.js sample code</title>
         <!-- Babylon.js -->
-        <script src="http://www.babylonjs.com/hand.minified-1.2.js"></script>
-        <script src="http://www.babylonjs.com/cannon.js"></script>
-        <script src="http://www.babylonjs.com/oimo.js"></script>
-        <script src="http://www.babylonjs.com/babylon.js"></script>
+        <script src="https://www.babylonjs.com/hand.minified-1.2.js"></script>
+        <script src="https://preview.babylonjs.com/cannon.js"></script>
+        <script src="https://preview.babylonjs.com/oimo.js"></script>
+        <script src="https://preview.babylonjs.com/babylon.js"></script>
         <style>
             html, body {
                 overflow: hidden;