Implement first test infrastructure

The KatamariTest class fires up a real netty server instead of using mocking classes.
Also, I used a thread to fire up netty in the background, but wait for it to start.
Not sure, maybe there are better methods, but I need to read more about Netty first.
Until then, this might work out, pretty good.

The AuthDecoderTest shows how to use this new infrastructure.

Closes #13