add '${arg.sclass}' placeholder to messagebox.zul
update Javadoc comment of Messagebox.java
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'
Featrue added ZK-2079: prevent autohiding of the paging control the paging mold
http://tracker.zkoss.org/browse/ZK-2079