docs(guide): add ui-router to complementary libraries

Author: Urigo

docs/content/guide/index.ngdoc

@@ -73,6 +73,7 @@ This is a short list of libraries with specific support and documentation for wo
 * **RESTful services:** [Restangular](https://github.com/mgonto/restangular)
 * **SQL and NoSQL backends:** [BreezeJS](http://www.breezejs.com/), [AngularFire](http://angularfire.com/)
 * **UI Widgets: **[KendoUI](http://kendo-labs.github.io/angular-kendo/#/), [UI Bootstrap](http://angular-ui.github.io/bootstrap/), [Wijmo](http://wijmo.com/tag/angularjs-2/)
+* **Advanced Routing:** [UI-Router](https://github.com/angular-ui/ui-router)
 
 ## Deployment