/**
  * Permite enviar a un usuario el correo de invitacion a un proyecto
  * @author Cesar Giraldo <*****@*****.**> 20/01/2016
  * @param Entity\ProjectInvitation $projectInvitation
  */
 public function sendProjectInvitationEmail(Entity\ProjectInvitation $projectInvitation)
 {
     $message = \Swift_Message::newInstance()->setSubject($this->translator->trans('backend.project_invitation_email.subject'))->setFrom(self::SENDER_GENERAL_EMAILS)->setTo($projectInvitation->getuser()->getEmail())->setBody($this->container->get('templating')->render('BackendBundle:Email:projectInvitation.html.twig', array('projectInvitation' => $projectInvitation)), 'text/html');
     $this->mailer->send($message);
 }