fine tune: tab.js
Merge branch 'fix-ie8' of https://github.com/huangnoah/zk into fix-ie8

Conflicts:
	zul/src/archive/web/js/zul/tab/mold/tab.js
reset HeadWidget.js
style fixed: the slider should show well when click at rail in ie8
B50-3188023: the Listbox add timeout fn into onSize() like grid, tree
style fixed: the h/vbox should show well in ie8
minor fix