Netty: Add hooks for Http related Handlers

I am running ResteEasy on top of Netty.
I want to add a custom Netty ChannelHandler that deals with Http (I want to generate an Access Log like Apache's)

The existing hooks via setChannelHandlers are executed before all the Http handlers.

I want to get a hook to be able to inject my handler after all the Http ones.

I'll prepare a Pull Request for this.