title: How to use nav.popTo() (ionic 2)?
body: <p>I'm using NavController. To go back I can use nav.pop(), but how to use nav.popTo() if I need go to the other page (not last)?</p>
  
  <pre><code>constructor(nav: NavController) {
  this.nav = nav;
  
  this.nav.push(MyNextPage);
  </code></pre>