     <td><code>$done</code></td>
                  <td><span class="label label-default">boolean</span></td>
                  <td>A convenience boolean that indicates if a promise is in progress.</td>
                </tr>
                <tr>
                  <td><code>$class</code></td>
                  <td><span class="label label-primary">string</span></td>
                  <td>The class that is currently applied, overwritten with your custom configuration if provided.</td>
                </tr>
   