add '${arg.sclass}' placeholder to messagebox.zul
update Javadoc comment of Messagebox.java
Bug fixed B70-ZK-1807: bandbox - messed display after its style changed http://tracker.zkoss.org/browse/ZK-1807
Merge branch 'B70-ZK-1807' of git://github.com/danchen0720/zk
Bug refix ZK-2061: the merge error causes vision test fail
Change tree's check icon to image in IE8
Bug fixed B70-ZK-2070: grid onScroll client-side event not working in 7.0 http://tracker.zkoss.org/browse/ZK-2070
Bug fixed ZK-2084: Doublespinner should display float value
http://tracker.zkoss.org/browse/ZK-2084
Merge branch 'add-sclass-to-messagebox' of https://github.com/yuki-takei/zk
Feature F70-ZK-2087: Add sclass to messagebox
http://tracker.zkoss.org/browse/ZK-2087
Merge remote-tracking branch 'Noah/B70-ZK-2084'