title: Property 'url' does not exist on type 'Event' for Angular2 NavigationEnd Event
body: <pre><code>    this.subscription = this.router.events.subscribe((event:Event) =&gt; {
          console.log(event.url); ##### Error : Property 'url' does not exist on type 'Event'.
     }
  </code></pre>
  
  <p>Typescript doesn't recognize the properties of the type Event that is built into the Angular Router. Is there something on tsd that I can use to solve this? Event is the super class of classes NaviagationEnd, NavigationStart</p>