title: Ionic2 - Labels not appearing for input
body: <p>I am trying to do something very basic: A label above the input field.
  For some reason, this is not working. Any clue ? </p>
  
  <pre><code>&lt;ion-header&gt;
     &lt;ion-navbar&gt;
        &lt;ion-title&gt;
           The App
        &lt;/ion-title&gt;
    &lt;/ion-navbar&gt;
  &lt;/ion-header&gt;
  
  &lt;ion-content&gt;
      &lt;ion-item no-lines&gt;
       &lt;ion-label stacked&gt;First name&lt;/ion-label&gt;
       &lt;ion-input&gt;&lt;/ion-input&gt;
      &lt;/ion-item&gt;
     &lt;ion-item no-lines&gt;
        &lt;ion-label stacked&gt;Last name&lt;/ion-label&gt;
        &lt;ion-input type="text" placeholder="Last Name"&gt;&lt;/ion-input&gt;
     &lt;/ion-item&gt;
  &lt;/ion-content&gt;
  
  &lt;ion-footer&gt;
    &lt;div (click)="goHome()"&gt;Cancel&lt;/div&gt;
    &lt;div (click)="save()"&gt;Update&lt;/div&gt;
  &lt;/ion-footer&gt;
  </code></pre>