fix zktest build issue
Fix bug ZK-1841: maximum allowed number of desktops is one more then the number set in the max-desktops-per-session element in zk.xml
http://tracker.zkoss.org/browse/ZK-1841
Bug fixed B65-ZK-1847: When sending a request without data to server,
the created event's data is an empty map instead of null
http://tracker.zkoss.org/browse/ZK-1847
revise comment
Bug ZK-1842: Listbox scroll bug listheader sort
Bug ZK-1839: Listbox select mold not works in listcell
fix for ZK-1836: Javascript string with </script> escape issue
FIX ZK-1777: Server Push does not initialize when recycling
testcase of b1848
Merge branch 'ZK-B65-1847' of git://github.com/RaymondChao/zk
Merge branch 'B65-ZK-1777' of git://github.com/cor3000/zk