generatedValue changed to GeneratedValue

[Doctrine\Common\Annotations\AnnotationException]                                                                             
  [Semantical Error] The annotation "@Doctrine\ORM\Mapping\generatedValue" in property XXX\CommentBundle\Entity\Vote::$id does   
  not exist, or could not be auto-loaded.
Merge pull request #428 from andrew-jones/patch-1

generatedValue changed to GeneratedValue