add more less variables for easy customizing
Merge branch 'fix-ie8' of git://github.com/huangnoah/zk into 7.0
add more less variables and mixin functions for easy customizing
the position of splitter should not change when drag/enddrag
minor tune
tune LESS variables
minor fix
Merge branch '7.0' of https://github.com/zkoss/zk into fix-ie8
Feature   ZK-1912: A component support preserve-blank
Bug  ZK-1911: Text-as with childable cannot work with preserve-blank for component setting
fix hover, active style sticky issue (IE only)
Merge branch '7.0' of github.com:zkoss/zk into 7.0
fixed for B65-ZK-1639.zul test case when introduced tree ROD new feature
Merge branch '7.0' of https://github.com/zkoss/zk into fix-ie8
minor fix