update Mario example
Merge pull request #63 from cvan/plink

forgo PeerJS in favour of plink; add signalling server (fixes #57; fixes #52)
add disclaimer
adjust `lockOrientation` because to avoid Firefox throwing a `TypeError`
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`