some alphabetizing
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.
Merge pull request #581 from haripetrov/patch-1

Update bg
Merge pull request #580 from Kikobeats/patch-1

Añadido libro de Coffeescript en español
Merge pull request #579 from colegleason/master

Added Building Blocks for Theoretical Computer Science
Merge pull request #578 from casual-passer/master

Added python books