fix #481 selectionKey/AutoCompleteModifier fail in IE

This is a temporary fix to make the test pass in IE, by changing the
modifier from Ctrl to Shift.
fix #482 disable animations in page engine for FF3.6
1.4.3
fix #483 state.__info can be undefined in aria.utils.History
fix #484 Invalid display of table frames when changing line-height.

This removes spaces (&nbsp;) in the markup of the table frame so
that table frames are displayed correctly, even when the line-height
CSS property is defined.
feat #472 Double Slider Widget
to fix mouse move