title: angular-cli how to add sass and or bootstrap?
body: <p>I'm trying out angular-cli and trying to get sass and bootstrap in the project. I've read in the <a href="https://github.com/angular/angular-cli/wiki/Stories">wiki</a> that you can simply do:</p>
  
  <pre><code>ng install sass
  </code></pre>
  
  <p>Doing this with the current latest (beta.5) gives me an error:</p>
  
  <pre><code>Install failed. Could not find addon with name: sass
  </code></pre>
  
  <p>How can I go about installing bootstrap and or sass in a way that angular-cli will deal with the index page and systemJS?</p>