title: Bower styles are not included in Yeoman Angular project
body: <p>I am completely new to Yeoman so I am still figuring out the workflow.  When I set up my application using <code>yo angular</code> it prompted to pick my options. I wanted to use Sass Twitter Bootstrap and Compass so I included it in my project.  At the bottom of the <code>index.html</code> page that was generated I can see this:</p>
  
  <pre><code>&lt;!-- build:js(.) scripts/vendor.js --&gt;
      &lt;!-- bower:js --&gt;
      &lt;script src="bower_components/jquery/dist/jquery.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/angular/angular.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/json3/lib/json3.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/affix.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/alert.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/button.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/carousel.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/collapse.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/dropdown.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/tab.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/transition.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/scrollspy.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/modal.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/tooltip.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/bootstrap-sass-official/assets/javascripts/bootstrap/popover.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/angular-resource/angular-resource.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/angular-cookies/angular-cookies.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/angular-sanitize/angular-sanitize.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/angular-animate/angular-animate.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/angular-touch/angular-touch.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/angular-route/angular-route.js"&gt;&lt;/script&gt;
      &lt;script src="bower_components/angular-bootstrap/ui-bootstrap-tpls.js"&gt;&lt;/script&gt;
      &lt;!-- endbower --&gt;
  &lt;!-- endbuild --&gt;
  </code></pre>
  
  <p>Which is what I expect to see.  All of the files I have asked for in my project being included.</p>
  
  <p>However, at the top I see this </p>
  
  <pre><code>&lt;!-- build:css(.) styles/vendor.css --&gt;
  &lt;!-- bower:css --&gt;
  &lt;!-- endbower --&gt;
  &lt;!-- endbuild --&gt;
  </code></pre>
  
  <p>This is baffling.  I expect to see all of my files there from bower just like I do with my JS.</p>
  
  <p>I've looked around but couldn't find anything on how to actually make this work or what that block of code is actually there for.  Do I need to make a <code>vendor.scss</code> file somewhere?</p>
  
  <p>How come my bower styles aren't being included?  How do I automate this within Yeoman?</p>