title: Ionic2 ion-item-sliding not working with *ngFor dynamic list
body: <p>ionic-angular version is 2.0.0-rc.2</p>
  
  <p>if I remove *ngFor, using a static list instead, it works fine. The following is the code snippet.</p>
  
  <pre><code>&lt;ion-list&gt;
      &lt;ion-item-sliding *ngFor="let item of items"&gt;
          &lt;ion-item&gt;
              &lt;h2&gt;{{item.subject}}&lt;/h2&gt;
          &lt;/ion-item&gt;
          &lt;ion-item-options side="right"&gt;
              &lt;button ion-button color="primary"&gt;
                  &lt;ion-icon name="mail"&gt;&lt;/ion-icon&gt; Email
              &lt;/button&gt;
          &lt;/ion-item-options&gt;
      &lt;/ion-item-sliding&gt;
  &lt;/ion-list&gt;
  </code></pre>