Byte of Python link and version updated

Added "ES6 Interactive Guide" on Interactive Programming Resources

Added Codefights to problem sets and competitive programming

[ja] Add 11 books and update a book

Added React.js Fundamentals course

Adding a new python book

Added entry for Julia with tutorials

Update free-programming-books.md

Added React short tutorial for beginners.

add javascript for cats in spanish

Commit Performance WEB

fix link to "Problem Solving with Algorithms and Data Structures"

fix link to "Problem Solving with Algorithms and Data Structures"

Removing  dead links from Django

[ja] Add 10books; C, C++, Julia*3, Pl, Py, R*3

Adding a new python book for the Jython implementation

add html5 book

adds Flexbox defense, a tower defense game you control with flexbox

Book HTML5 Shoot 'em Up in an Afternoon - Bryan Bibat 
Complete source of the book: https://github.com/bryanbibat/html5shootemupinanafternoon 
After one click on the button "add ebook to cart" it's freely avaliable in thiese formats: pdf, epub, mobi and also this book purchase comes with a zip file containing extras!

space removed

[ja] 6books; Blender, SAT solver, Git, Haskell, JS, Scratch

Update dead link for "Mostly Adequate Guide to Functional Programming"

Original link returned 404

a new addition to the #git list