added several new resources

update with vhf:master

update Chinese resources

Added MySQL tutorial & database textbook in ja.

add several resources, including two new category: Erlang and Scheme
reconstruct the architecture of the .md file

added new categories: vim, R
added new resources in LaTeX and Python categories
fixed a invalid link in the content

Added MySQL tutorial & database textbook in ja.
These books are free to share with IPA license

IPA (http://www.ipa.go.jp/index-e.html)

Update Eloquent Javascript link, 2nd ed. is out.

Added OpenGL tutorial in ja

Added a majority of the books found in issue #688. 

Added OpenGL tutorial in ja. (We still need more tutorials in ja...)

OpenGLのチュートリアルも少ないので足しました。

Added a majority of the books found in issue #688. I excluded one book that looks like it had an illegal download link and also all books in other languages (mainly French).

Removed link to inaccessible link for Rails resource

Added Structure and Interpretation of ... in ja

Add 2 python books

Add "PureScript By Example"

プログラミングの理論の項があるべきだと思いこの本を追加させていただきます。

「計算機プログラムの構造と解釈」
プログラミングの根幹をなす様々な理論を学び、実践する力も得られる教科書です。
楽しく、明快に、かつ実践を通して学ぶというMITの信念を体現したような本です。
MITや多くの最高レベルのCS Departmentで教科書として読まれています。

Learn Python in Y minutes
The Python Ecosystem: An Introduction

Add section for Meteor with a link to new free book

Removed duplicate link to Dashing d3.js.

Added a new book on Titan Graph Database

Added a new book on Titan Graph Database

Isabelle/HOL - fix anchor link

Update free-programming-books.md

No longer published

Anchor link for Isabelle/HOL was not working when viewing the Github parsed file.

Fix formatting

add "The Python GTK+ 3 Tutorial"