Data#40_yuanzhe:modify db structure
Data#40_yuanzhe:modify db structure,each record add commit_id field
Data#40_yuanzhe:modify dao for new structure
Data#40_yuanzhe:generate version id
Data#40_yuanzhe:modify dao for updateactions
Data#40_yuanzhe:modify findall method,find update item both in history and operations
Data#40_yuanzhe:base on dao change,modify upper api
Merge pull request #109 from huyuanzhe/Data#40_yuanzhe

Data#40 yuanzhe->xiquan