Merge pull request #1079 from akshaymohite/master

Removed link to inaccessible link for Rails resource
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).
Added OpenGL tutorial in ja

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。
Merge pull request #1080 from Kentoseth/master

Added a majority of the books found in issue #688.
Merge pull request #1081 from jinnaiyuu/patch-2

Added OpenGL tutorial in ja
Update Eloquent Javascript link, 2nd ed. is out.
Merge pull request #1082 from arnorb/patch-1

Update Eloquent Javascript link, 2nd ed. is out.
Added MySQL tutorial & database textbook in ja.

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 Chinese resources

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

add several resources, including two new category: Erlang and Scheme
reconstruct the architecture of the .md file
Merge pull request #1083 from jinnaiyuu/patch-3

Added MySQL tutorial & database textbook in ja.
Merge pull request #1084 from sunxb10/master

update Chinese resources
Merge pull request #1 from vhf/master

update with vhf:master
update Chinese resources

added several new resources
fixed a typo
Merge pull request #1086 from sunxb10/master

Added new resources in zh.md (Chinese)
Added The GNU C Programming Tutorial
Merge pull request #1087 from bit4bit/master

Added The GNU C Programming Tutorial
Add Programación de videojueos con SDL to spanish books