fix zk-1795-nested-template
fixed the js error when invoked isScrollIntoView() with document.body only
Bug fixed B65-ZK-1803: Setting a textbox visible=false and invalidate
its parent leading to "Failed to mount" error in Firefox
http://tracker.zkoss.org/browse/ZK-1803
Merge branch 'zk-1795-nested-template'

Conflicts:
	zkdoc/release-note
Merge branch 'B65-ZK-1803' of git://github.com/RaymondChao/zk