Split proxy into own package

[IvanSanchez]

The proxy example is quite complex for an example, IMHO. But it might be the minimal working example of the asbs.Server capabilities.

Anyway, a proper proxy with some kind of persistent world model is needed. The minimal world model is just the statuses of the player ships' consoles. Ideally, there should be a full world model which is sent to the clients when they connect and/or mark themselves as ready.

[mrfishie]

I'm planning on splitting the world model part of node-artemis ito its own package.. that could be used.