fix access denied listener, add tests

Author: lsmith77

EventListener/AccessDeniedListener.php

@@ -74,12 +74,12 @@ public function onKernelException($event)
         }
 
         if ($exception instanceof AccessDeniedException) {
-            $exception = new AccessDeniedHttpException('You do not have the necessary permissions', $exception);
+            $exception = new AccessDeniedHttpException('You do not have the necessary permissions');
         } elseif ($exception instanceof AuthenticationException) {
             if ($this->challenge) {
-                $exception = new UnauthorizedHttpException($this->challenge, 'You are not authenticated', $exception);
+                $exception = new UnauthorizedHttpException($this->challenge, 'You are not authenticated');
             } else {
-                $exception = new HttpException(401, 'You are not authenticated', $exception);
+                $exception = new HttpException(401, 'You are not authenticated');
             }
         }