public function addSupporter(Supporter $supporter)
{
$q = $this->_db->prepare('INSERT INTO supporter SET login = :login, mdp = :mdp, email = :email');
$q->bindValue(':login', $supporter->getLogin());
$q->bindValue(':mdp', $supporter->getMdp());
$q->bindValue(':email', $supporter->getEmail());
echo $supporter->getNom();
$q->execute();
}