/**
  * getManager
  *
  * Return the authentication manager
  * 
  * @param  \Zend_Auth $auth The authentication manager
  * @return Multiverse\Auth\Manager
  */
 public function getManager()
 {
     if (null == $this->manager) {
         $this->manager = new Manager($this->getAuth());
         $this->manager->setAdapter($this->getAdapter());
     }
     return $this->manager;
 }