Add free german book an ruby

Fixed spelling mistake

Added Program Arcade Games With Python And Pygame

Added BetterSpecs (RSpec guidelines with Ruby)

Conflicts:
	free-programming-books.md

Added some books

Added You Don't Know JS

Added author names in various places

L'arte di scrivere con LaTeX - L. Pantieri e T. Gordini

[es] Updated index and +1 book on TDD

[ja] +Parallel Prog Sec with 4 books, +3 Python books, Update style aligned with en version

Removed some paid books and repetitions

- Removed 'E-Books Directory' because it's another list;
- Removed 'Messaging as a Programming Model' because it is not free;
-

Book not freely available online.  Link points to a table of contents, not the actual contents of the book.

A nice eBook from the people at GuIT (Gruppo utilizzatori Italiani di TeX).

Add "Scrum and XP from the Trenches" by H. Kniberg and translated versions in fr, de, es, it and ru

Made some changes and additions to brazilian portuguese list. Also deleted ilegal book from spanish list

Added SMACSS book

Added the Apigee 'OAuth - The Big Picture' ebook to the 'Software Architecture' list.

Add french book and french course on Coq by Bertot

Updated "Up and Running with Node" link