fix modal-closing logic
create hosted Firefox manifest for controller as a web app
begin hooking up gamepad to Commander Keen game
add nice icon for controller
gracefully handle client disconnects; spruce up event listeners and overall greatness here and there (fixes #82)
add verbose comments explaining steps (issue #84); rename `_handshake` method to `_pair`
Merge pull request #85 from cvan/game

hook up a game, add lots more signalling/peer pairing logic