docs(guide): add ng-book link to books

Closes angular#4792

Author: auser

docs/content/guide/index.ngdoc

@@ -134,6 +134,7 @@ This is a short list of libraries with specific support and documentation for wo
 * [AngularJS Directives](http://www.amazon.com/AngularJS-Directives-Alex-Vanston/dp/1783280336) by Alex Vanston
 * [Recipes With AngularJS](http://www.amazon.co.uk/Recipes-Angular-js-Frederik-Dietz-ebook/dp/B00DK95V48) by Frederik Dietz
 * [Developing an AngularJS Edge](http://www.amazon.com/Developing-AngularJS-Edge-Christopher-Hiller-ebook/dp/B00CJLFF8K) by Christopher Hiller
+* [ng-book: The Complete Book on AngularJS](http://ng-book.com/) by Ari Lerner
 
 ###Videos:
 * [egghead.io](http://egghead.io/),