Initial positioning commit
Added default offset. 'title' attribute is removed on show and reinstated on hide. Trigger height is no longer used to determine position.
Added u$.position method
Removed u$.position. This functionality is better implemented as a plugin.
Replace mover with $.fn.move
Tooltip now works with $.fn.moveTo
Refactored tests, triggers receive 'aria-describedby' attribute.
Tooltip now triggered by keyboard focus/blur
Removed onHide delay since it is not really needed.
Minor refactoring
Updated to use setTimeout for keyboard events, since the browser needs time to catch up the jump in scroll position.
Deleted unnecessary test file.