add '${arg.sclass}' placeholder to messagebox.zul
update Javadoc comment of Messagebox.java
Feature refix ZK-1856: Tree support frozen as grid
http://tracker.zkoss.org/browse/ZK-1856
Merge branch 'master' of https://github.com/zkoss/zk into F70-ZK-1856
rm console.log, console.trace
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
Merge branch 'master' of https://github.com/zkoss/zk into fix-70
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
Feature added ZK-2012: zk.ie supports ie11
http://tracker.zkoss.org/browse/ZK-2012
Merge branch 'master' of https://github.com/zkoss/zk into fix-70
Merge branch 'master' of https://github.com/zkoss/zk into F65-ZK-2012
fix IE8 issue
Merge branch 'master' of github.com:zkoss/zk
introduce Tabbox Engine.
fix typo
Merge branch 'master' of github.com:zkoss/zk
Merge branch 'F65-ZK-2012' of git://github.com/huangnoah/zk
ZK-1989, able to enchance tracker node implementation to reduce memory footprint