Add a function to refresh opened libraries. The source URL of each libraries is now tracked, which allows for auto refreshing the libraries based on various events. The obvious use case is to refresh the library when an atom has been added to Scald, for example via a Popups dialog.

/** 
 * IE is completely stupid about relative elements and stacking elements 
 * http://therealcrisp.xs4all.nl/meuk/IE-zindexbug.html
 * This fix is specific to this demo page and won't be needed for most
 * uses of BeautyTips
 */
div.example {
	position: static;
}