Location header is not set correctly for resource creation

I have the following routes:

```

return array(
    'router' => array(
        'routes' => array(
            'user' => array(
                'type' => 'Segment',
                'options' => array(
                    'route' => '/users[/:userId]',
                    'defaults' => array(
                        'controller' => 'User\Controller\User',
                    ),
                ),
                'may_terminate' => true,
                'child_routes' => array(
                    'address' => array(
                        'type' => 'Segment',
                        'options' => array(
                            'route' => '/addresses[/:addressId]',
                            'defaults' => array(
                                'controller' => 'User\Controller\UserAddress',
                            ),
                        ),
                    ),
                ),
            ),
        ),
    ),
);
```

The identifier name is userId instead of id to be able to add child routes. In the UserResource onCreate method:

```
  public function onCreate(ResourceEvent $e)
    {
        // ... some stuff here

        return array('id' => $user->getId());
    }
```

The HAL _self link is rendered correctly. But the code for the location header sets the route param with key "id" instead of the identifier_name which I set to "userId". That's why the location path will be "/users", instead of "/users/1" what is should be.

ResourceController.php line 353:
``` 
$response->getHeaders()->addHeaderLine(
            'Location',
            $this->halLinks()->createLink($this->route, $resource->id, $resource->resource)
        );
```