title: MatDialog Error: No provider for InjectionToken mat-dialog-scroll-strategy
body: <p>By including Provider: MatDialog in the Constructur</p>
  
  <pre class="lang-js prettyprint-override"><code>constructor(groupService: GroupService, public dialog: MatDialog) {}
  </code></pre>
  
  <p>I get following error at runtime </p>
  
  <blockquote>
    <p>Error: No provider for InjectionToken mat-dialog-scroll-strategy!</p>
  </blockquote>
  
  <p>I have included the Matdialog in the "app.module.ts"
  Do I need a different Provider for it and which one? I use angular-material 2.0.0b12</p>