Added "Marionette Exposé: Learn to write modular Javascript applicatons using...

Added "Marionette Exposé: Learn to write modular Javascript applicatons using Backbone Marionette and RequireJS/AMD"

free-programming-books.md

@@ -897,6 +897,7 @@
 * [Learn to Code JavaScript by Playing a Game](http://codecombat.com)
 * [Learning JavaScript Design Patterns](http://www.addyosmani.com/resources/essentialjsdesignpatterns/book/) - Addy Osmani
 * [Managing Space and Time with JavaScript - Book 1: The Basics](http://www.noelrappin.com/)  - Noel Rappin
+* [Marionette Exposé: Learn to write modular Javascript applicatons using Backbone Marionette and RequireJS/AMD](http://leanpub.com/marionetteexpose) - Jack Killilea
 * [Mozilla Developer Network's JavaScript Guide](https://developer.mozilla.org/en/JavaScript/Guide)
 * [O'Reilly Programming JavaScript Applications - Early Release](http://chimera.labs.oreilly.com/books/1234000000262/index.html)
 * [The JavaScript Tutorial](http://javascript.info/)