title: Ionic 2 twitter embedded timeline issue
body: <p>Im trying to use a twitter embedded time line in my ionic 2 app.
  So far i have the code shown  below, however after the user leaves the view the time line disappears? Is there something im missing here? </p>
  
  <pre><code>&lt;ion-header&gt;
   &lt;ion-navbar&gt;
     &lt;button ion-button menuToggle&gt;
      &lt;ion-icon name="menu"&gt;&lt;/ion-icon&gt;
    &lt;/button&gt;
      &lt;ion-title&gt;Social Media&lt;/ion-title&gt;
    &lt;/ion-navbar&gt;
  &lt;/ion-header&gt;
  &lt;ion-content padding&gt; 
    &lt;a class="twitter-timeline"  href="https://twitter.com/hashtag/amyawards2017" data-widget-id="837781109337436160"&gt;#amyawards2017 Tweets&lt;/a&gt;
    &lt;!--&lt;script&gt;!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");&lt;/script&gt;--&gt;
  &lt;/ion-content&gt;
  
  
  
  
  export class SocialMediaPage{
    constructor(public navCtrl: NavController,
    private loadingCtrl: LoadingController,private toastCtrl: ToastController,
    private alertCtrl: AlertController,
    public twitter: TwitterService) {
  
    }
  
     ngAfterViewInit() {
              !function(d,s,id){
                  var js: any,
                      fjs=d.getElementsByTagName(s)[0],
                      p='https';
                  if(!d.getElementById(id)){
                      js=d.createElement(s);
                      js.id=id;
                      js.src=p+"://platform.twitter.com/widgets.js";
                      fjs.parentNode.insertBefore(js,fjs);
                  }
              }
              (document,"script","twitter-wjs");
      }
  
  
  
  }
  </code></pre>