RB.DialogView is a wrapper around $.modalBox() that makes it easy to

construct, show, and hide modal dialogs. It can be instantiated and

bound to an element to show the contents of that element as a dialog, or

it can be subclassed to allow another view to act as a dialog.

Used this in a couple other changes I've been working on. Had it here

a while and decided to just pull it out and submit it.
Unit tests pass. Note that I didn't add unit tests for actually showing

the dialog, since it's a modal dialog that updates document.body, and

thus couldn't easily be sandboxed.