Update jquery-overlay-z-0.2.2.js

Add close button, close on escape, and close on click outside of body.

NOTE: The close button is relative to the window instead of relative to the body because the body gets completely overridden with `$overlayz.overlayz.html()` and `$overlay.overlayz.body`. This could be fixed in the future by having yet another sub-element (e.g., "content").