Changes

* Found and fixed ticket [https://processing-js.lighthouseapp.com/projects/41284/tickets/667-keycode-undefined-in-sketches 667]

* Original scope of [https://processing-js.lighthouseapp.com/projects/41284/tickets/374-difference-between-p5-and-pjs-keyboard-input 374] deemed improper and will need a revamp of the keyCode for all browsers