Currently it's configured through the factory. The strategy factory fetches the "ZfrRest\View\Renderer\ResourceRenderer" key, and if you want to switch factory, you need to override this key.

Maybe we could expose an option into ZfrRest config, like "renderer" => "foo". Or even a config like that:

```php
'zfr_rest' => [
    'renderers' => [
       'application/json' => 'ZfrRest\View\Renderer\DefaultRenderer'
   ]
];
```

What do you think @Ocramius ?