title: md-select doesn't trigger ngModelChange or change events
body: <p>I have this code:</p>
  
  <pre><code>&lt;md-select [(ngModel)]="model" (change)="updateModel()" 
  (ngModelChange)="model=$event;updateModel()"&gt; [...] &lt;md-select&gt;
  </code></pre>
  
  <p>but when I update the model programmatically, neither (change) nor (ngModelChange) 
   are fired 'cause updateModel() is never called.</p>