Bug ZK-1877: Can not drag a slider, which is in a grid, to 0
Bug ZK-1878: IE Compatibility View issue when using Meta tag with IE=edge
Refix for ZK-1878: IE Compatibility View issue when using Meta tag with IE=edge
fine tune
Bug ZK-1875: DateFormatConverter should be serializable
testcase of zk-1873
Bug fixed B65-ZK-1884: The slider's value should not be greater then
maxpos after clicked its rightmost position 
http://tracker.zkoss.org/browse/ZK-1884
minor fix slider's animation
minor fix test case