title: Angular2, relative navigation (two levels back ../../)
body: <p>I have a back button in my application, which navigates relatively some levels back. In case of one level </p>
  
  <pre><code>this.router.navigate(['..'], { relativeTo: this.route });
  </code></pre>
  
  <p>it works perfectly (resulted route url:<code>http://localhost:3000/three/two/one</code>). In case of two level back rel. navigation</p>
  
  <pre><code>this.router.navigate(['..', '..'], { relativeTo: this.route });
  </code></pre>
  
  <p>router navigates two levels back, <strong>BUT</strong> the resulted route url looks now like <code>http://localhost:3000/three/two/</code>(tailing slash, which is not correct). </p>
  
  <p>Am I doing something wrong or could it be a bug? </p>