Bumped version in the quickstart to 26

Author: SamVerschueren

public/docs/js/latest/quickstart.jade

@@ -216,7 +216,7 @@
       <title>Angular 2 Quickstart</title>
       <script src="https://github.jspm.io/jmcriffey/[email protected]/traceur-runtime.js"></script>
       <script src="https://jspm.io/[email protected]"></script>
-      <script src="https://code.angularjs.org/2.0.0-alpha.%3Cspan%20class="x x-first x-last">23/angular2.dev.js"></script>
+      <script src="https://code.angularjs.org/2.0.0-alpha.%3Cspan%20class="x x-first x-last">26/angular2.dev.js"></script>
     </head>
 
   p.