Récupération des Elements: rangés par created (timestamppable).

src/Muzich/CoreBundle/Repository/ElementRepository.php

         SELECT e FROM MuzichCoreBundle:Element e
         JOIN e.owner u
         WHERE u.id = :uid
-        ORDER BY e.id DESC'
+        ORDER BY e.created DESC'
       )
       ->setParameter('uid', $user_id)
       ->setMaxResults($limit)
         JOIN e.owner u
         JOIN e.group g
         WHERE g.id = :gid
-        ORDER BY e.id DESC'
+        ORDER BY e.created DESC'
       )
       ->setParameter('gid', $group_id)
       ->setMaxResults($limit)