python books
haskell book
Update free-programming-books-fr.md

Added 3 PHP books
Added 1 git book
Added 1 python book
Added 1 Assembly book
Added Upgraded to Rails 4 github repo.
Add Python Module of the Week

The Python Module of the Week series is a tour of the Python standard library through short examples.
Merge pull request #214 from johand/python_books

python books
Merge pull request #216 from johand/haskell_book

haskell book
Merge pull request #217 from cosinuz/patch-1

Update free-programming-books-fr.md
Merge pull request #218 from canibanoglu/add-upgrade-rails-4

Added Upgraded to Rails 4 github repo.
Merge pull request #219 from ericguirbal/fr

Add french books and fix markdown
Merge pull request #220 from zhujs/master

Add Python Module of the Week
adding Learn Haskell fast and hard
Merge pull request #221 from ktkaushik/master

adding Learn Haskell fast and hard
added Machine Code for Beginners
added Machine Language for Beginners
Merge pull request #222 from gingerbeardman/master

Added two vintage, but still quite relevant Machine Code/Assembly books
added CPU notes
Merge pull request #223 from gingerbeardman/master

added CPU notes
Added link to "Reinforcement Learning: An Introduction" by Sutton & Barto
Add link to How To Think Like a Computer Scientist *Interactive edition*

There's a free and pretty great interactive edition of HTLCS. Code samples can be edited and executed in the browser. Some code samples can even be stepped through. Add link to this.