筛除放错位置的文件
Review Young's part by ripe
Merge pull request #27 from ripeconan/develop

Review Young's part by ripe
Merge pull request #28 from chenyuqing/develop

commit chp13 by vicky
Update task.md

燃芝 chp11
Update task.md

燃芝 chp11
筛除放错位置的文件
updata task
更改task
Merge branch 'develop' of github.com:flymark2010/data-science into develop
add chp9
Update chp9.md
Merge pull request #29 from flymark2010/develop

Update task
ripe takes the translation task of chp14
Merge pull request #30 from ripeconan/develop

ripe takes the translation task of chp14
Update task.md
15/7/2014