Merge pull request #26 from ivanzhaowy/master

Bug fixes.
Merge pull request #27 from ivanzhaowy/master

Path fix
 fix bugs
Merge pull request #28 from leplay/master

 fix bugs
Merge pull request #29 from ivanzhaowy/master

Update style
 add wdb & fix
Merge pull request #30 from leplay/master

 add wdb & fix
Bug fix.
Bug fix.