Update free-programming-books.md

Fixed typo.
added Windows Phone 8 Development Succinctly

added free ebook "Windows Phone 8 Development Succinctly" from syncfusion.

link: http://www.syncfusion.com/resources/techportal/ebooks/windowsphone8
added author and file type
Merge pull request #807 from Misterhex/master

added Windows Phone 8 Development Succinctly
[es] New section (& book): Erlang
Adding Code Guide to HTML/CSS section.
Add a single haskell book
[es] Adding Erlang book
append two parallel programming books
Merge pull request #808 from HungMingWu/master

Append two parallel books
Polish translation of PHP: The right way.
Polish translation of Pro Git book
Merge pull request #809 from piotrl/master

Polish translations of PHP and Git books.
Fixed Django Anchor in Index
Merge pull request #810 from pyrocat101/patch-1

Fixed Django Anchor in Index
added learn pandas to the list
Merge pull request #811 from bmcculley/adding_a_resource

added learn pandas to the list (python)
Apuntes de Algoritmos y Estructuras de Datos
Merge pull request #812 from alejolp/master

Apuntes de Algoritmos y Estructuras de Datos
Updated JavaScript list

Added Google JavaScript Style Guide. Also alphabetized the JavaScript list.