title: Only Light or Dark for an Angular Material Theme?
body: <p>Do you have to choose just Light or Dark for an Angular Material Theme?  I've checked the latest tool of Angular Material:</p>
  
  <p><a href="https://material.io/tools/color/#!/?view.left=0&amp;view.right=0" rel="nofollow noreferrer">https://material.io/tools/color/#!/?view.left=0&amp;view.right=0</a></p>
  
  <p>And it shows three options, light, dark, and one without light or dark.</p>
  
  <p>But when I go to my mat-theme.scss it seems I can only pick 'mat-light-theme' or 'mat-dark-theme'.  Is there an options for neither light or dark, as the ColorPicker seems to show.</p>