title: Symfony doctrine:schema:update not working
body: <p>I have a strange problem :
  I have an application symfony 2.3 (with sonata user)
  I created a bundle with one entity - the entity was created without a problem
  then I had to modify the entity and now it seems to be impossible to modify the schema :</p>
  
  <p>To see what happens I increased all the string lengths with +1</p>
  
  <p>The entity code (with annotations) :</p>
  
  <pre><code>namespace Too\ConfigAppBundle\Entity;
  
  use Gedmo\Mapping\Annotation as Gedmo;
  use Doctrine\ORM\Mapping as ORM;
  
  /**
   * ConfigApp
   *
   * @ORM\Table(name="ConfigApp")
   * @ORM\Entity(repositoryClass="Too\ConfigAppBundle\Entity\ActiviteRepository")
   */
  class ConfigApp
  {
      /**
       * @var integer $id
       *
       * @ORM\Column(name="id", type="integer")
       * @ORM\Id
       * @ORM\GeneratedValue(strategy="AUTO")
       */
      private $id;
  
      /**
       * @var string $nom
       *
       * @ORM\Column(name="nom", type="string", length=101, unique=true)
       */
      private $nom;
  
      /**
       * @var string $nomSlug
       *
       * @Gedmo\Slug(fields={"nom"}, updatable=true, separator="_")
       * @ORM\Column(name="nomSlug", type="string", length=101, nullable=true)
       */
      private $nomSlug;
  
      /**
       * @var string $email
       *
       * @ORM\Column(name="email", type="string", length=151)
       */
      private $email;
  
      /**
       * @var string $telephone
       *
       * @ORM\Column(name="telephone", type="string", length=16)
       */
      private $telephone;
  
      /**
       * @var datetime $cree_le
       *
       * @Gedmo\Timestampable(on="create")
       * @ORM\Column(name="cree_le", type="datetime")
       */
      private $cree_le;
  
      /**
       * @var datetime $modifie_le
       *
       * @Gedmo\Timestampable(on="update")
       * @ORM\Column(name="modifie_le", type="datetime")
       */
      private $modifie_le;
  
      ...
  </code></pre>
  
  <p>Now see the result of :</p>
  
  <pre><code>php app/console doctrine:schema:update --dump-sql
  
  CREATE TABLE ConfigApp (id INT AUTO_INCREMENT NOT NULL, nom VARCHAR(100) NOT NULL, nomSlug VARCHAR(100) NOT NULL, email VARCHAR(150) NOT NULL, telephone VARCHAR(15) NOT NULL, cree_le DATETIME NOT NULL, modifie_le DATETIME NOT NULL, PRIMARYKEY(id)) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB
  </code></pre>
  
  <p>None of the new length is taken in account : 
  for example the field nom should have length=101,
  but the dump-sql gives nom VARCHAR(100) !</p>
  
  <p>Could anyone try to figure out whats going wrong ?
  Thanks !</p>
  
  <p>EDIT :
  I tried to clear the cache before with :
  * php app/console doctrine:cache:clear-metadata
  * php app/console cache:clear
  * by deleting all content in cache folders</p>
  
  <p>I also tried --dump-sql and --force.</p>
  
  <p>This changes nothing at all.
  Please any hint would be welcome !</p>