Update free-programming-books.md

Adding RESTful Web Services book
Added a very good and complete book for Java and added iOS book
Update free-programming-books.md

Added C# book
C#
Merge remote-tracking branch 'upstream/master'
Added Node.js Removed ad
Merge pull request #485 from mobi-soft/patch-2

Added Node.js Removed ad
Blender 3D: Noob to Pro
Merge pull request #486 from Erendis/patch-1

Blender 3D: Noob to Pro
Added 'Prolog for Programmers'

A book by Feliks Kluźniak, Stanisław Szpakowicz & Janusz S. Bień, first published in 1985.
Merge pull request #487 from miku/master

Added 'Prolog for Programmers'
Added: Data Jujitsu, jQuery Novice to Ninja, Ad Hoc Data Analysis From The Unix Command Line
Merge pull request #488 from TobyRoseman/master

Added: Data Jujitsu, jQuery Novice to Ninja, Ad Hoc Data Analysis From T...
Added HTML Canvas Deep Dive
Merge pull request #490 from martinvd/patch-2

Added HTML Canvas Deep Dive
Added "Kanban and Scrum - making the most of both"
Merge pull request #491 from seralf/master

Added "Kanban and Scrum - making the most of both"
Fixes #489
Correct typo
Spanish LaTeX Index Markdown Issue