Add and remove HotKey handler for keyboard events supporting almost any key combination.

The syntax is as follows:

    $(document).on('keydown', 'ctrl+a', fn);

Example configuration for inserting a Link with the HotKey `Ctrl-u` (default: `Ctrl-l`)

Aloha.settings = {
	plugins: {
		link: {
			hotKey: { insertLink: 'ctrl+u' }
		}
	}
}

1. Types Supported types are `‘keydown’`, `‘keyup’` and `‘keypress’`

1. Addendum Firefox is the most liberal one in the manner of letting you capture all short-cuts even those that are built-in in the browser such as `Ctrl-t` for new tab, or `Ctrl-a` for selecting all text. You can always bubble them up to the browser by returning `true` in your handler.

Others, (IE) either let you handle built-in short-cuts, but will add their functionality after your code has executed. Or (Opera/Safari) will not pass those events to the DOM at all.

So, if you bind `Ctrl-Q` or `Alt-F4` and your Safari/Opera window is closed don’t be surprised.

Code from jquery.hotkeys

• not implemented yet Reference: https://docs.google.com/support/bin/answer.py?answer=179738