Books from hackershelf; created Russian list

I also fixed line with 'mod_perl', because underscore in Markdown
means emphasis and it continues at the rest of the file (at least in
vim).

Added Jeff Erickson's Algorithms Course Materials

2 Mathematica Books added

Added introductory book on parallel computing

Includes homework and his algorithms course notes.  Only reason it's not a book is that Jeff says "All textbooks suck."

* [Stephen Wolfram's The Mathematica Book] (http://reference.wolfram.com/legacy/v5_2/)
* [Wolfram Mathematica Tutorial Collection] (http://www.wolfram.com/learningcenter/tutorialcollection/)

This book "is intended to provide only a very quick overview of the extensive and broad topic of Parallel Computing."  There is another book by the same title, but its text isn't free.

assembleur 64 bits

2 books on (plain) TeX

Liste de livres en Français

Adds J

importation de fhttp://progdupeu.pl/forums/suje43/une-banque-de-liens + corrections divers de markdown

added some tutorials and style-guides to Ruby and Rails sections

liste de livre en français sur python (620d0b0e) et latex (2c1157c5 373ddcb5) dans un fichier à part

Added the Language Agnostic subsections to TOC

Add Problem Solving with Algorithms and Data Struc

more hackershelf books, some refactoring

Found myself scrolling through the Language Agnostic section a lot; added TOC for quicker access.

Add Problem Solving with Algorithms and Data Structures. Since it is
written in python, I have added it twice.

This was suggested by Fabian Dablander on the Python community on
Facebook.

Add Dart language;
Reorder meta-lists, add O'Reilly Commons and hacker shelf
Remove duplicate (Bayesian Methods for Hackers)
Additions from hackershelf

Put Flask under Python

Adding Octave

Update free-programming-books.md