Fix ZK-1692
Fixed bug B65-ZK-1804: Calendar should not be able to select year less
than 1900 or greater than 2099
http://tracker.zkoss.org/browse/ZK-1804
Merge branch 'master' of https://github.com/zkoss/zk into B65-ZK-1804
add comment for B65-ZK-1804
fine tune ZK-1526, ZK-483
Merge branch 'B65-ZK-1804' of git://github.com/RaymondChao/zk
ZK-1715: add disabled in item 4 and 5
ZK-1706: the width of empty space does not always eq 3px in ie9, ie10
Merge branch 'B65-ZK-1706' of git://github.com/huangnoah/zk
minor fix
Fix bug ZK-1834: Listbox scroll bug
http://tracker.zkoss.org/browse/ZK-1834
add release date
release 6.5.3
fine tune LESS variables
fine tune tree style
update version to 6.5.4
fix LESS mixins
Bug ZK-1836: Javascript string with </script> escape issue
Merge branch 'master' into 7.0
Bug ZK-1837: Checking the checkbox inside the groupbox should not trigger the onOpen event of Groupbox