Added Think Like (a) Git to the Git book list.

Added "Wie werde ich unix guru" to DE

added git section and pro git book

Add a link to Mother Tongues of Computer Languages Poster

Update free-programming-books.md

Added book to Machine Learning section

Great poster!

I added some more Free Python sources and a link to PDF file.

Textbook draft of Probabilistic Models in the Study of Language.

Added the HoTT book.

Add more books to the list and fixed markdown

Add some ruby books and courses

Added C++ online site, learncpp.com

first list of spanish resources

Add german book list (more will follow soon)

Update free-programming-books.md

added javascript's http://devdocs.io/

Fix typo

Added "Making Games with Python & Pygame" to "free-programming-books.md"

Add portuguese list of books to README

Added Tango With Django.