Added besimple.soap.response service

It is highly recommended not to instantiate BeSimple\SoapBundle\Soap\SoapResponse
but to use the service besimple.soap.response

Before:

    public function helloAction($name)
    {
        return new SoapResponse("Hello ".$name);
    }

After:

    public function helloAction($name)
    {
        return $this
            ->container
            ->get('besimple.soap.response')
            ->setReturnValue("Hello ".$name)
        ;
    }

Resources/doc/tutorial/array.rst

@@ -9,7 +9,6 @@ Controller
     namespace My\App\Controller;
 
     use BeSimple\SoapBundle\ServiceDefinition\Annotation as Soap;
-    use BeSimple\SoapBundle\Soap\SoapResponse;
     use Symfony\Component\DependencyInjection\ContainerAware;
 
     class DemoController extends ContainerAware
@@ -21,6 +20,6 @@ Controller
          */
         public function helloAction(array $names)
         {
-            return new SoapResponse("Hello ".implode(', ', $names));
+            return $this->container->get('besimple.soap.response')->setReturnValue("Hello ".implode(', ', $names));
         }
     }