Fix bug ZK-1714: Databinding 1 cannot clear selection item
http://tracker.zkoss.org/browse/ZK-1714
Fix bug ZK-1715: The disabled listitem shall not be selected when use SHIFT + DOWN key with a paging listbox
http://tracker.zkoss.org/browse/ZK-1715
Merge remote-tracking branch 'VincentJian/B65-ZK-1715'
new 7 cases
Merge pull request #17 from huangnoah/new-20130412

New 20130412
minor tune
Merge branch 'master' of github.com:zkoss/zk
Fix F55-ZK-314
B65-ZK-1720: XSS Vulnerability for fileupload
Merge branch 'master' of github.com:zkoss/zk
add comment
Merge branch 'Fix-F55-ZK-314' of git://github.com/huangnoah/zk
minor fine tune