QuestionMark.jsWhen the user pushes the ? key, QuestionMark.js triggers a modal window that displays keyboard shortcuts for your app — similar to what happens on Twitter, Gmail, GitHub, etc. Hat tip to Robert Nyman. The modal is removed when the ESC key is pushed or the user clicks behind the modal. I think every app that has keyboard shortcuts should do this. This could also be a generic 'help' menu for the app
