Resizable: does not respect original body cursor like Draggable does.

In Draggable, the jQuery UI code stores the original cursor set in the body element into the options list at start(), and restores the body to the original cursor at stop(). Resizable just blows away whatever the original cursor was on the body element. The Resizable code should be updated so it works the same as the Draggable code in terms of respecting what the original body cursor was. It should save the original body cursor in _mouseStart and restore it in _mouseStop instead of just blindly setting it to "auto" in _mouseStop.