Merge pull request #606 from rodrigo-medeiros/js-fundamentals

Added the 'Javascript and Node FUNdamentals' book to the 'Node.js' list.

free-programming-books.md

@@ -927,7 +927,7 @@
 * [Mixu's Node Book](http://book.mixu.net/node/)
 * [The Node Beginner Book](http://nodebeginner.org/)
 * [Node: Up and Running](http://chimera.labs.oreilly.com/books/1234000001808/index.html) - Tom Hughes-Croucher
-
+* [JavaScript and Node FUNdamentals](https://leanpub.com/jsfun/read) *(Leanpub - by Azat Mardanov)*
 
 ###LaTeX
 * [The Not So Short Introduction to LaTeX](http://tobi.oetiker.ch/lshort/lshort.pdf) (PDF)