[JA] Add Sections: Linux, Maven, Mercurial, SQL
Merge pull request #352 from luminousspice/ja

[JA] Add Sections: Linux, Maven, Mercurial, SQL
Add "The Boost C++ Libraries", Boris Schäling
Add german book "Die Boost C++ Bibliotheken", Boris Schäling
Add german book "Programmieren in C++: Einführung", B. Schäling
Add german book "Programmieren in C++: Aufbau", B. Schäling
Add two german books on Java by Boris Schäling
Merge pull request #353 from ericguirbal/en

Add "The Boost C++ Libraries", Boris Schäling
Add german book "Programmieren in C#: Enführung", Schälling
Add german book "Webseiten erstellen mit Javascript", Schälling
Add german book "Der moderne Softwareentwicklungsprozess mit UML", Schäling
Merge pull request #354 from ericguirbal/de

Add some german books by Boris Schäling
[JA] Add Clojure section with 3 books
[JA] Add an Android Secure Coding book
[JA] Update credits of 2 books
Update free-programming-books.md

Erlang programming book is not free!
Update free-programming-books.md

Another Erlang programming book that isn't free!
Update free-programming-books.md

- ASP.NET MVC book is represents a deprecated version of ASP.NET MVC;
- Added JavaScript Garden tutorial;
Create free-programming-books-pt_PT.md
Update README.md

- Added the portuguese list of books/magazines;
- Brazilian and Portuguese lists are now diferenciated;