Added 2 books to Chinese(zh) list.
Modified MOOC list from Chinese(zh) list.

Free programming books in Turkish

Add "CoolAid: The Cool 2013 Reference Manual"

Describes the programming language Cool: the Classroom
Object-Oriented Language.

Update free-programming-books.md

Added the JS Robots chapter from Expert Javascript book

Update free-programming-books.md

changed "Graphics User Interfaces" into "Graphical User Interfaces"

added "Deep C" under entry of C material.

Update for 'pl' file : Book added: Pisanie OS

Fixed link to How to be a Programmer

Update free-programming-books-es.md - new resource

merge assembly with "ensamblador" (spanish list)

both catergories are the same. I also put the title of Lisa Watts's book in spanish (as the translations version has)

Update free-programming-books.md

added Twitter share button

I couldn't add a Facebook share button because I don't have an account but here is the link if someone else wants to add it:

https://developers.facebook.com/docs/plugins/like-button/

Initial removal of english books from chinese(zh) books list.

Some changes

- Removed "A Course in Machine Learning". There were 2 same links in the
list. One of them kept which is originally belong the author
- Added 1 Android and 2 Powershell books

Add a coffeescript book

Adding Arduino

Added "A Course in Machine Learning"

Added two Tcl books

Add a ruby on rails metaprogramming book

Added "Kestrels, Quirky Birds, and Hopeless Egocentricity" under the Ruby on Rails.

Add Explore Flask book (crowdfunded)