added C notes in Turkish
Merge pull request #570 from ferhatelmas/add-new-for-tr

added C notes in Turkish
Removed dead link
Added latex reference

This is one of my favourite references for latex, since it actually covers a lot of topics, and also references a lot of packages (not only core latex)
Merge pull request #571 from markijbema/patch-1

Removed dead link
Merge pull request #572 from markijbema/patch-2

Added latex reference
Added Conquering the Command Line
Merge pull request #573 from markbates/master

Added Conquering the Command Line
add 'AN INTRODUCTION TO PROGRAMMING IN GO' link
Added 'Go Tour' in Korean
Merge pull request #574 from atomaths/master

Added 2 links to Go
some alphabetizing
create separate md file for interactive materials
Merge pull request #576 from engstrom/master

Some Alphabetizing
Added python books
Added Building Blocks for Theoretical Computer Science
Añadido libro de Coffeescript en español
actualizado para que funcione el hyperlink
Update free-programming-books-es.md
Update free-programming-books-bg.md

Допълнение на настоящия списък с книги за програмиране на български език.