Added SoapResponseListener

This listener allow return a raw result from the action.

Before:
    /**
     * @Soap\Method("hello")
     * @Soap\Param("name", phpType = "string")
     * @Soap\Result(phpType = "string")
     */
    public function helloAction($name)
    {
        return $this->container->get('besimple.soap.response')->setReturnValue(sprintf('Hello %s!', $name));
    }

After:
    /**
     * @Soap\Method("hello")
     * @Soap\Param("name", phpType = "string")
     * @Soap\Result(phpType = "string")
     */
    public function helloAction($name)
    {
        return sprintf('Hello %s!', $name);
    }

EventListener/SoapResponseListener.php

@@ -0,0 +1,56 @@
+<?php
+
+/*
+ * This file is part of the BeSimpleSoapBundle.
+ *
+ * (c) Christian Kerl <christian-kerl@web.de>
+ * (c) Francis Besset <francis.besset@gmail.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace BeSimple\SoapBundle\EventListener;
+
+use BeSimple\SoapBundle\Soap\SoapRequest;
+use BeSimple\SoapBundle\Soap\SoapResponse;
+use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
+
+/**
+ * SoapResponseListener.
+ *
+ * @author Francis Besset <francis.besset@gmail.com>
+ */
+class SoapResponseListener
+{
+    /**
+     * @var SoapResponse
+     */
+    protected $response;
+
+    /**
+     * Constructor.
+     *
+     * @param SoapResponse $response The SoapResponse instance
+     */
+    public function __construct(SoapResponse $response)
+    {
+        $this->response = $response;
+    }
+
+    /**
+     * Set the controller result in SoapResponse.
+     *
+     * @param GetResponseForControllerResultEvent $event A GetResponseForControllerResultEvent instance
+     */
+    public function onKernelView(GetResponseForControllerResultEvent $event)
+    {
+        $request = $event->getRequest();
+        if (!$request instanceof SoapRequest) {
+            return;
+        }
+
+        $this->response->setReturnValue($event->getControllerResult());
+        $event->setResponse($this->response);
+    }
+}