Added Laravel: Code Smart online book (#1986)

Added Dayle Rees's Laravel: Code Smart book to the PHP list.

free-programming-books.md

@@ -1638,6 +1638,7 @@ For resources on Angular, Backbone, D3, Dojo, Ember, Express, jQuery, Knockout,
   * Laravel 5
     * [Laravel 5.x Official Documentation. Synced Daily](https://leanpub.com/laravel-5)
     * [Laravel Best Practices](http://www.laravelbestpractices.com)
+    * [Laravel: Code Smart](https://daylerees.com/codesmart/) - Dayle Rees
     * [Laravel Collections Unraveled](https://leanpub.com/laravelcollectionsunraveled)
 * [PHP 5 Power Programming](http://www.informit.com/content/images/013147149X/downloads/013147149X_book.pdf) (PDF)
 * [PHP Best Practices](https://phpbestpractices.org)