Unregister during runtime

[MartinMuzatko]

Similar to how redbird works, it would be nice to be able to remove listeners during runtime.

[eoinmurray]

This would be awesome

[MartinMuzatko]

I moved to http-proxy-middleware.
Using express, you can switch the router during runtime.

[eoinmurray]

@MartinMuzatko I actually figured out how to do it using redwire, and have made pull request

#16