Support HTTPS includes

Author: robertdimarco

examples/todos/index.html

@@ -40,11 +40,11 @@ <h1>Todos</h1>
     <br />Rewritten by: <a href="http://addyosmani.github.com/todomvc">TodoMVC</a>.
   </div>
 
-  <script src="http://cdnjs.cloudflare.com/ajax/libs/json2/20121008/json2.js"></script>
-  <script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
-  <script src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.3/underscore-min.js"></script>
-  <script src="http://cdn.firebase.com/v0/firebase.js"></script>
-  <script src="http://cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.10/backbone-min.js"></script>
+  <script src="//cdnjs.cloudflare.com/ajax/libs/json2/20121008/json2.js"></script>
+  <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
+  <script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.3/underscore-min.js"></script>
+  <script src="//cdn.firebase.com/v0/firebase.js"></script>
+  <script src="//cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.10/backbone-min.js"></script>
   <script src="backbone-firebase.js"></script>
   <script src="todos.js"></script>