title: Doctrine in Symfony3 invalid mapping file
body: <p>I just createt a Bundle FIRM/ComCollectBundle (with the name FirmComCollectBundle). Then I created a File src/FIRM/ComCollectBundle/Resources/config/doctrine/ForumUser.orm.yml with this content:</p>
  
  <pre><code>FIRMComCollectBundle\Entity\ForumUser:
    type: entity
    table: forum_users
    repositoryClass: FIRM\ComCollectBundle\Entity\ForumUserRepository
    id:
      id:
        type: integer
        generator: { strategy: AUTO }
    fields:
      name:
        type: string
        length: 30
  </code></pre>
  
  <p>when I now try to use the console to create entities</p>
  
  <pre><code>$ php bin/console doctrine:generate:entities FIRM\CommCollectBundle\ForumUser
  </code></pre>
  
  <p>I get this error:</p>
  
  <pre><code>[Doctrine\Common\Persistence\Mapping\MappingException]                       
    Invalid mapping file 'FIRM.ComCollectBundle.Entity.ForumUser.orm.yml' for cl  
    ass 'FIRM\ComCollectBundle\Entity\ForumUser'.    
  </code></pre>
  
  <p>The same error (about ForumUser) even appears when I try to generate entities for another bundle (AppBundle)!</p>