title: Angular2 (alpha.55) and SystemJs fails
body: <p>I don't understand why since I use alpha.55 version of angular2, my project fails to load properly.</p>
  
  <p>Error in my browser:</p>
  
  <pre><code>GET http://localhost:8080/angular2/platform/browser.js 404 (Not Found)fetchTextFromURL ...
  GET http://localhost:8080/angular2/core.js 404 (Not Found)fetchTextFromURL ...
  GET http://localhost:8080/angular2/http.js 404 (Not Found) ....
  ...
  </code></pre>
  
  <p>In the header of my index.html file</p>
  
  <pre><code>&lt;script src="\lib\system.src.js?v=0.1.0"&gt;&lt;/script&gt;
  &lt;script src="\lib\angular2.dev.js?v=0.1.0"&gt;&lt;/script&gt;
  &lt;script src="\lib\http.dev.js?v=0.1.0"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>And the way I load all the stuff</p>
  
  <pre><code>System.config(
          {
              defaultJSExtensions: true,
              map: {
                  "bootstrap": "/components/landing/landing.js"
              }
          });
  System.import('bootstrap');
  </code></pre>
  
  <p>Then my landing.js file</p>
  
  <pre><code>import {Http, Headers, HTTP_PROVIDERS} from 'angular2/http';
  import {bootstrap} from 'angular2/platform/browser';
  import {Component, View, Type} from 'angular2/core';
  blabla...
  </code></pre>
  
  <p>Do you have any idea why systemjs is not using dowloaded bundles (angular and http bundles) anymore ?</p>