Fix for issues #146 (#147)

* Fix in response return

Without this fix only RedirectResponse can be returned. In my project I send response by JsonRespons and I had to make this fix.

Controller/RegistrationManager.php

@@ -5,7 +5,7 @@
 use PUGX\MultiUserBundle\Model\UserDiscriminator;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use FOS\UserBundle\Controller\RegistrationController;
-use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\HttpFoundation\Response;
 use PUGX\MultiUserBundle\Form\FormFactory;
 
 class RegistrationManager
@@ -50,14 +50,14 @@ public function __construct(UserDiscriminator $userDiscriminator,
     /**
      * @param string $class
      *
-     * @return \Symfony\Component\HttpFoundation\RedirectResponse
+     * @return \Symfony\Component\HttpFoundation\Response
      */
     public function register($class)
     {
         $this->userDiscriminator->setClass($class);
         $this->controller->setContainer($this->container);
         $result = $this->controller->registerAction($this->getRequest());
-        if ($result instanceof RedirectResponse) {
+        if ($result instanceof Response) {
             return $result;
         }