invoke Javascript destroy for DateBox and DateTimeBox on unload of GWT widget
Version to 2.3.2.2-TB-SNAPSHOT
Revert "Version to 2.3.2.2-TB-SNAPSHOT"

This reverts commit dd1f841ad3d0982ee23dda1dbc571963eb6efb92.
Merge pull request #402 from tbuckel/unload

Invoke Javascript destroy for DateBox and DateTimeBox