title: ng-bootstrap Datepicker current date like placeholder
body: <p>I use ng-bootstrap Datepicker something like here: <a href="http://plnkr.co/edit/wwbmDw23bkKdqc8zvdDG?p=preview" rel="noreferrer">plnkr example</a></p>
  
  <pre><code>&lt;div class="input-group"&gt;
    &lt;input class="form-control" placeholder="yyyy-mm-dd"
           name="dp" [(ngModel)]="model" ngbDatepicker #d="ngbDatepicker"&gt;
    &lt;div class="input-group-addon" (click)="d.toggle()" &gt;
      &lt;img src="img/calendar-icon.svg" style="width: 1.2rem; height: 1rem; cursor: pointer;"/&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>and I would like have placeholder as current date instead yyyy-mm-dd.
  For example today 23.10.2016.
  It is possible or how can i do that.</p>