[en] Adding book on Open Source section
fixing c35e423 commit: adding schemme
Added What's New in Java 8
Add - Build Your Own Lisp to C Books
Merge pull request #865 from modernprog/master

Added What's New in Java 8
Merge pull request #866 from komrade/master

Add books in Russian on Perl, Ruby and VIM
Merge pull request #867 from glanotte/master

Add - Build Your Own Lisp to C Books
Update free-programming-books.md

Added free book on partial evaluation.
Merge pull request #868 from vdeurzen/patch-1

Update free-programming-books.md
Added TONC GBA

Programming for the Game Boy Advance.

It is C + Assembly so I'm not sure where to put it.
Merge pull request #869 from felipebueno/patch-1

Added TONC GBA
Merge pull request #864 from esparta/master

[en] Adding book on Open Source section
Use http link instead of ftp

The ftp:// protocol is not recognized as a link.
Merge pull request #870 from edwlook/patch-1

Use http link instead of ftp
Ruby on Rails 3.2 für Ein-, Um- und Quereinsteiger
Ruby on Rails 3.2 - Step by Step
Ruby on Rails 4.0 Guide
Remove duplicate entry
Merge pull request #871 from danielbayerlein/ruby-on-rails

Ruby on Rails
added Elasticsearch: The Definitive Guide