Added Diseño Ágil con TDD
Fixing Index (alphabetical Order)
L'arte di scrivere con LaTeX - L. Pantieri e T. Gordini

A nice eBook from the people at GuIT (Gruppo utilizzatori Italiani di TeX).
Added author names in various places
Remove Torgo Data Mining with R

Book not freely available online.  Link points to a table of contents, not the actual contents of the book.
Added You Don't Know JS
Update free-programming-books.md

- Removed 'E-Books Directory' because it's another list;
- Removed 'Messaging as a Programming Model' because it is not free;
-
Added BetterSpecs (RSpec guidelines with Ruby)
Update free-programming-books.md

Removed some paid books and repetitions
Update free-programming-books.md
Merge pull request #387 from luminousspice/ja

[ja] +Parallel Prog Sec with 4 books, +3 Python books, Update style aligned with en version
Merge pull request #388 from esparta/master

[es] Updated index and +1 book on TDD
Merge pull request #389 from pac37/master

L'arte di scrivere con LaTeX - L. Pantieri e T. Gordini
Merge pull request #390 from lluang/master

Added author names in various places
Merge pull request #391 from brunogirin/master

Added You Don't Know JS
Update free-programming-books.md

Added some books
Merge branch 'patch-1' of github.com:BlueKore/free-programming-books into BlueKore-patch-1

Conflicts:
	free-programming-books.md
Readd erlang author
Merge pull request #393 from katgironpe/master

Added BetterSpecs (RSpec guidelines with Ruby)