some revise
fix bug:改正本地版本无head&tail
Merge branch 'Data' of ssh://github.com/IbpTeam/demo-rio into Data#40_xiquan
修改：更改逻辑准备
Merge branch 'Data' of ssh://github.com/IbpTeam/demo-rio into Data#40_xiquan
fix bug:hastable isExist()
hashtable imporvement
修改update逻辑：update history适用多有向关系
Merge branch 'Data' of ssh://github.com/IbpTeam/demo-rio into Data#40_xiquan
fix bug
fix bug
update修改：可处理update history中多个有向版本;待测试
Merge branch 'Data' of ssh://github.com/IbpTeam/demo-rio into Data#40_xiquan
fix bug:localCompare undefined
merge #148
fix bug
fix bug:当对方数据为空时出错;待测试
Merge pull request #150 from shuanzi/Data#40_xiquan

Data#40_xiquan->wangfeng
Merge pull request #154 from shuanzi/data2_xiquan

data2_xiquan->yuanzhe
add comment in buildDes file