public function deleteAction(User $user, Calendar $calendar)
{
$em = $this->getDoctrine()->getManager();
$em->remove($calendar);
$em->flush();
$this->get('session')->getFlashBag()->add('notice', 'Calendar <i class="fa fa-calendar"></i> <strong>' . htmlspecialchars($calendar->getDisplayname()) . '</strong> has been deleted.');
return $this->redirect($this->generateUrl('baikal_admin_user_calendar_list', array('id' => $user->getId())));
}