How do I disable the CORS headers completely? In my setup, they are handled at the reverse proxy level instead of at individual service level I also see that cors plugin is initialized twice at [L325](https://github.com/flywheelsports/hydra-express/blob/master/index.js#L325) and [L389](https://github.com/flywheelsports/hydra-express/blob/master/index.js#L389)
