title: Wrong composer configuration on a reusable symfony bundle
body: <p>I created a new bundle available here : 
  <a href="https://github.com/PHPDreamTeam/pink-flamingo-user-bundle" rel="nofollow noreferrer">https://github.com/PHPDreamTeam/pink-flamingo-user-bundle</a></p>
  
  <p>I want to install it using composer, I created a composer package, I published it on packagist and finally, I can install it, but it fails to load when I do in AppKernel :</p>
  
  <p><code>new PHPDreamTeam\PinkFlamingoUserBundle\PinkFlamingoUserBundle()</code></p>
  
  <p>This is my error : 
  <code>
  Attempted to load class "PinkFlamingoUserBundle" from namespace "PinkFlamingoUserBundle".
  Did you forget a "use" statement for "PHPDreamTeam\PinkFlamingoUserBundle\PinkFlamingoUserBundle"?
  </code></p>
  
  <p>What's wrong with my project?</p>