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.