Clientcontext file parser

Initial binary file template and event emitter for client context files.

I added a quick example block to server.coffee for the events to listen for, but I imagine you may want to implement them differently.

I haven't had time to work on the full integration, but wanted to get what I've done over to you.

Work still to be done:
* write tests
* listen for events
* add location data to the player list structure in memory
* display location data somewhere