title: Ionic2 how to get NavController in provider
body: <p>I create AuthHttpProvider which is Http wrapper which allow to send GET/POST/PUT/DELETE request and automagically add authentication token (jwt) to each request. And I use this wrapper instead Http in all my ionic2 app. Now i want to logout user (and go to loginPage) when I detect that any response from server has 403 Http error code. </p>
  
  <p>So when I try to inject NavController (to use it to loginPage after 403 detection) in constructor by</p>
  
  <pre><code>constructor (public navCtrl: NavController)
  </code></pre>
  
  <p>I get:</p>
  
  <pre><code>Uncaught (in promise): Error: No provider for NavController
  </code></pre>
  
  <p>How to get access to navCtrl inside Provider?</p>