title: Add a class to ng-grid row
body: <p>I'm using ng-grid to display a collection of files that are being uploaded (each file has its own row). </p>
  
  <p>If one/any of the files fails to upload, I'd like to modify that row and put a class on it to show that it failed to upload. </p>
  
  <p>How would I go about adding a class to an entire row? </p>