title: add icon with UI-grid celltemplate
body: <p>Here is the tutorial link for angular ui-grid editable feature.
  <a href="http://ui-grid.info/docs/#/tutorial/201_editable" rel="nofollow noreferrer">UI-Grid Editable Link</a></p>
  
  <p>Every row is editable (not header). But I want to add icon to let the user know that this row or cell is editable. </p>