public function supprimerAction(Article $article)
 {
     $form = $this->createDeleteForm($article->getId());
     $form->handleRequest($this->get('request'));
     if ($form->isValid()) {
         $em = $this->getDoctrine()->getManager();
         $em->remove($article);
         $em->flush();
         $this->get('session')->getFlashBag()->add('success', 'Article a été supprimé');
     }
     return $this->redirect($this->generateUrl('isl_blog_index'));
 }