Merge pull request #337 from chuanjin/master

Update free-programming-books.md
lisp book
Links are not rendered correctly on http://resrc.io/list/10/list-of-free-programming-books/#erlang
Merge pull request #339 from clemens-tolboom/patch-1

Links are not rendered correctly on http://resrc.io/
Merge pull request #338 from johand/lisp_book

lisp book
Adding "A pragmatic guide to Backbone.js apps"
Merge pull request #340 from sillero/master

Adding "A pragmatic guide to Backbone.js apps"
Add a backbone tutorial to js frameworks
retroingénirie binaire->c
Merge pull request #342 from maieul/master

retroingénirie binaire->c
Adding Java EE 7 Tutorial
Merge pull request #343 from slhrkc/patch-1

Adding Java EE 7 Tutorial
Updating the list to include free Salesforce/Force.com books

Salesforce developers actually have a great resource on Developer Force - http://developer.force.com/ - but I wanted to add some of the books Salesforce has released to this list to share with everyone. Salesforce's languages are Apex (similar to Java) and Visualforce (similar to HTML)
Merge pull request #344 from jessealtman/patch-1

Updating the list to include free Salesforce/Force.com books
Fixing a broken link in the Index to properly link to the section below for Force.com
Merge pull request #345 from jessealtman/patch-2

Fixing a broken link in the Index to properly link to the section below ...
Update free-programming-books.md

added content for MATLAB programming
Merge pull request #346 from toddatkinsiii/patch-1

Update free-programming-books.md
retroingénierie python
Merge pull request #347 from maieul/master

retroingénierie python