title: Using composer to install third party symfony bundle
body: <p>Ok. Composer seems great.</p>
  
  <p>But is more complex that deps method to add new bundles. I still don´t get it.</p>
  
  <p>Please someone give me a complete example on how to add a third party bundle to a <code>symfony2 2.1.0-BETA4</code> installation.</p>
  
  <p>The bundle I want to add is <a href="https://github.com/doctrine/data-fixtures/" rel="nofollow">this</a>.</p>