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)
        ;
    }

Soap/SoapResponse.php

@@ -58,6 +58,8 @@ class SoapResponse extends Response
     public function setReturnValue($value)
     {
         $this->soapReturnValue = $value;
+
+        return $this;
     }
 
     public function getReturnValue()