Initial commit
First version of chap6

Please have it reviewed and pull request, thank you!
Change tables into snapshots from original book
delete html preview, remove /User/.../chap6
add back html file, and solve picture path problem
Add img folder to store images used in chap6.md
Update task.md

status update
Initial commit
try
Merge pull request #2 from kfeng123/develop

Develop
almost complete
almost complete
renling
Merge branch 'develop' of https://github.com/kfeng123/data-science into develop
section one
Merge pull request #3 from kfeng123/develop

almost complete
Merge pull request #1 from AndrewHub/gh-pages

chap6翻译初稿
Reviewed by Lynn

增加了复习内容
Merge branch 'gh-pages' of https://github.com/johnstart/data-science into gh-pages
Merge pull request #4 from AndrewHub/gh-pages

Reviewed by Lynn