title: AngularJS UI-Router event when changing route
body: <p>Using ngRoute once can hook up in event: <code>$routeChangeStart</code> and do different actions ...</p>
  
  <pre><code> app.run(function ($rootScope, $location) {
      $rootScope.$on("$routeChangeStart", function (event, next, current) {
      ................
  </code></pre>
  
  <p>Is it possible to achieve the same using UI-Router?</p>