fix jquery url for v2

2/index.html

@@ -613,7 +613,7 @@
   </div>
 
 
-  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
+  <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
   <script src="js/jquery.smooth-scroll.min.js"></script>
   <script src="js/bootstrap.min.js"></script>
   <script src="js/bootswatch.js"></script>