[BUG #8560] removed unused methods
[BUG #8560] moved button test one level up
[BUG #8560] fixed item minHeight (can't call setStyle on a documentFragment)
[BUG #8560] added tests for widget factory methods
[BUG #8560] fixed list/item height
[BUG #8560] fixed group header data attribute
[BUG #8560] fixed maps demo