Update free-programming-books-ja.md
Merge pull request #319 from yuuki5555/patch-1

Add japanese translation of "Learn you some Erlang for great good!"
Add "Guia Rápido de Desenvolvimento para Firefox OS" book and organize lists

The lists were short, disorganized and confused, then I organized by "front-end" and "back-end".
Merge pull request #320 from diessicode/patch-1

Add a new book and organize lists