We have a handful of dialogs that use $.modalBox to create a modal on

the screen. In most cases, these have a "Close" or "Cancel" button, but

pressing the escape key wouldn't do anything. This change adds some

additional event handling to capture keypresses on the dialog itself as

well as the overlay and the base body element. This is then plumbed into

a "close" event triggered on the element, which the caller can handle to

perform whatever action necessary to close the dialog.

Used in conjuction with a change on the Review Board side.