Single player save state

Single player mode will now persist the state of the game between refreshes and closed tabs until the game is forfeited. This saved state is stored in localStorage so opening a private window will result in a fresh game state.

Working single player mode without multiplayer server dependency

It is now possible to play single player mode even if the multiplayer server is not working or down for maintenance.

fix black castling direction logic

v0.4.1

update README

Support for multiplayer using socket.io

Merge pull request #1 from barrymun/multiplayer-support

Multiplayer support

Working game client-side

v0.2.0

remove index.html comments