Web demo

[nirs]

Have a static demo playing a pre-created (or randomly generated) game. Can be served as part of the documentation.

The game can be simulated by client side "server" receiving control requests (e.g. start/stop/rate) and emitting game update messages, using a pre-created game state.

Being able to replace a real sever with client side fake server is a good idea regardless the demo, for testing the web interface. Currently the server is accesses via the Client class and also directly via jquery.post. The code to post message should move into the Client.