Update free-programming-books-es.md Adding Git

Adding a spanish Git resource on http://librosweb.es.
#Adding a Python resource to Spanish list

Python para principiantes
http://www.librosweb.es/python/
Make the README a little more clear
Merge pull request #508 from voltagex/patch-1

Make the README a little more clear
Merge pull request #507 from Robalni/master

Header and index corrections
Merge pull request #506 from cmeraz/master

Update free-programming-books-es.md Adding Git
	included additional Bash resources:   free-programming-books.md
	additional books:   free-programming-books.md
Fixes two typo
	more resources:   free-programming-books.md
	modified:   free-programming-books.md
	modified:   free-programming-books.md
Merge pull request #510 from glenfordwilliams/master

more resources(linux, java, graphics, c++...etc)
Added LaTeX German Reference Book
Added Awk section and book by Bruce Barnett
Merge pull request #511 from unsignedzero/master

Added LaTeX German Reference Book
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