Feature added ZK-2012: zk.ie supports ie11
http://tracker.zkoss.org/browse/ZK-2012
Merge branch 'F65-ZK-2012' of git://github.com/huangnoah/zk into 6.5
zkdoc: move ZK-2012 from Bug to Feature
Merge branch '6.5' of https://github.com/zkoss/zk into F65-ZK-2012

Conflicts:
	zkdoc/release-note
ZK-1989, able to enchance tracker node implementation to reduce memory footprint
Merge branch '6.5' of github.com:zkoss/zk
fix popup contain icon not show up in ie8