Datepicker: Initial commit of widget rewrite work from old branch. History is on the datepicker-dead branch.
Datepicker: Get datepicker's test suite to at least run. It fails horribly, but at least it loads with its dependencies.
Datepicker: Updating/fixing the animation demo.
Merge remote-tracking branch 'origin/datepicker'

Conflicts:	ui/jquery.ui.datepicker.js