Add Ruby in Twenty Minutes and Ruby User's Guide

Add cpprefjp, C++ Reference Site in Japanese

adding complete guide for learning backbone.js

Add Computer Networking: Principles, Protocols and Practice (CNP3)

https://sites.google.com/site/cpprefjp/

cpprefjp is C++ reference for Japanese.  This site is written by many
C++ experts including C++ starndard committee members and updated lively.
References are based on latest C++ specification known as C++11
(ISO/IEC14882:2011).  And there are many samples to understand C++ and
C++ STL library quickly.
It's very helpful for Japanese C++ Programmers.

koans

Added the Programming Historian. This is another Intro Python choice

Add French book: Systèmes Informatiques, O. Bonaventure

codehero

Add 'GNU Emacs Lisp Reference Manual'.

Add Node.js API ko docs

Add Korean free-programming-books File

Add "Computer Science Concepts in Scratch", M. Armoni

learn X in Y minutes

Add french books about PGF/TikZ, Metapost and Asymptote

Update free-programming-books.md

Add Arquitectura Solida Java book

Added in an new book D3 Tips and Tricks

Added "Basics of compiler design" by Torben Mogensen

python wikibook