Update free-programming-books.md

Adding RESTful Web Services book
Added a very good and complete book for Java and added iOS book
Merge pull request #474 from yelinaung/master

Fixed link for C++ Cookbook
Fixes issue #472
Merge pull request #475 from breakingcrypto/patch-1

Fixes issue #472
Update free-programming-books.md

Added C# book
[ja] +1 Python book
Merge pull request #477 from luminousspice/ja

[ja] +1 Python book
Update free-programming-books-pl.md
Merge pull request #478 from zawieja/master

Update pl.md : C++
en : Ubuntu Server Guide
Add portuguese translation of "XP from the Trenches", Kniberg
Add japanese translation of "Scrum and XP from the Trenches", Kniberg
Add chinese translation of "Scrum and XP from the Trenches", Kniberg
Fix anchors (persian)
Fix a link
Merge pull request #481 from ericguirbal/fr

Fix a link
Merge pull request #480 from ericguirbal/fix-anchors

Fix anchors (persian)
Merge pull request #479 from ericguirbal/kniberg

Translated versions of "Scrum and XP from the Trenches" in japanese, chinese and portuguese
LaTeX and Persian Conflict