Adding Python interactive tutorial
Add Vim Adventures to free-programming-interactive
Merge pull request #894 from rudylee/patch-1

Add Vim Adventures to free-programming-interactive
Added book made available by Alexandre Fiori
Merge pull request #895 from pmoranga/patch-1

Added book made available by Alexandre Fiori
Adds Polish HTML & CSS book
Sort list to alphabetical order
Merge pull request #896 from Bartuz/master

Adds Polish HTML & CSS book
Vim adventures : not free
Add ATS language (like ML) manual in Japanese
Update free-programming-books-zh.md

A free Chinese book about design and implementation of Redis
Thanks author [huangz](https://github.com/huangz1990)
Merge pull request #897 from master-q/patch-1

Add ATS language (like ML) manual in Japanese
Merge pull request #898 from jasonlvhit/patch-1

Update free-programming-books-zh.md
Add "Learn Git".
Update free-programming-books.md
Merge pull request #900 from darkness/patch-1

Update free-programming-books.md
Merge pull request #899 from dpree/master

Add "Learn Git".
added cocoadevcentral.com
Add Ruby in 20 minutes book
Merge pull request #901 from duncanmccoll/patch-1

added cocoadevcentral.com