added a Drupal Framework section under php literature with a couple of free online drupal books
Added The wikibooks 'x86 Assembly guide'
Add empty italian list
Merge pull request #121 from sbilde/master

Added a Drupal Framework section under php literature with a couple of f...
Merge pull request #122 from revollat/master

Added "Network Security Tools" book to the Network section
Merge pull request #124 from Gallefray/master

Added The wikibooks 'x86 Assembly guide'
Added first line (python) in italian list
Merge pull request #125 from OpenCode/patch-1

Added first line (python) in italian list
Added book by David MacKay

Information Theory, Inference, and Learning Algorithms
Merge pull request #126 from corragon/patch-1

Added book by David MacKay to Machine Learning section
Added gitref.org. I've found this site really useful :)
Added book to Datamining section

The Elements of Statistical Learning: Data Mining, Inference, and Prediction.  By Trevor Hastie, Robert Tibshirani, and Jerome Friedman
Added Ralf Brown's Interrupt List. I think there's a downloadable version somewhere?
Added book to Mathematics section

Introduction to Statistical Thought by Michael Lavine
Update free-programming-books.md
Added the C programming guide from wikibooks.
Merge pull request #127 from corragon/patch-2

Added book to Datamining section
Merge pull request #128 from Gallefray/master

Added some more books. I've found both of these extremely useful :)
Merge pull request #129 from corragon/patch-3

Added book to Mathematics section
Merge pull request #130 from diegodfsd/master

Update free-programming-books.md