fixed bug of tree,add plugin for grid
delete files
修改日期控件可锁定时间无法修改.
修改lockTime功能

Signed-off-by: Dio <zqjimlove@gmail.com>
Merge pull request #49 from zqjimlove/issue_48

修改日期控件可锁定时间无法修改.
Merge branch 'master' of https://github.com/dxq613/bui
add lock time of calendar,fixed bug of tree
change test case
fixed bug of #51,#52
fixed bug of #52
fixed bug of setField
fixed bug #53