Release 1.1.0 with multiplayer support.

This is a post Ludum Dare release. Cooperative two player support was
added through a startup menu. This should work seemlessly with DOSBox's
default settings. Mouse support has been removed because this release
isn't being reviewed by an audience lacking gamepads.

1.0.1

Documentation updates.

1.0.0

Completed game, release 1.0.0.