title: Symfony2 - HWI/OAuthBundle can't find user provider
body: <p>Trying to connect facebook using <code>HWI/OAuthBundle</code>, following all of the steps that say in <a href="https://github.com/hwi/HWIOAuthBundle/blob/master/Resources/doc/index.md" rel="noreferrer">HWI/OauthBundle Doc</a>, but it return error </p>
  
  <blockquote>
    <p>There is no user provider for user "HWI\Bundle\OAuthBundle\Security\Core\User\OAuthUser"</p>
  </blockquote>
  
  <p>Does anyone can explain for me why this happen and how to fix this problem?</p>