Added basic utility functions for getting cursor positions with respect to elements and element positions.  This code is not robust to CSS at all.  We should look at using getBoundingClientRect and jQuery.
Added basic utility functions for getting cursor positions with respect to elements and element positions.  This code is not robust to CSS at all.  We should look at using getBoundingClientRect and jQuery.

hashcube/js.io,gameclosure/js.io,gameclosure/js.io,hashcube/js.io