title: md-select with multiple - limit amount of selected showing
body: <p>When using the Angular Material md-select with multiple, every single item selected will be displayed. I have a multiple selector showing counties, and they are all supposed to be pre-selected.
  This results in a list containing 30+ items, not looking very nice for the page setup.</p>
  
  <p>Any options that can limit the selections showing after they have been selected?</p>
  
  <p>Is it somehow possible to display the md-select-text when you exceed a limit, in my case 3 or more?</p>
  
  <p>Any other solutions?</p>
  
  <p><a href="https://material.angularjs.org/latest/demo/select" rel="nofollow">Link</a> to several codepen examples</p>