title: formatting date angularjs ui-grid
body: <p>I am trying to change the way date is being displayed. 
  the data is coming as string with the format "Sun May 03 18:04:41 2009"</p>
  
  <p>i looked at the examples, and they were asking me to use</p>
  
  <pre><code>$scope.gridOptions = {
    data: 'mydata',
    enableRowSelection: true,
    multiSelect: false,
    enableColumnResize: true,
    columnDefs: [
      { field: 'startDate', displayName: 'Date', cellFilter: 'date:\'yyyy-MM-dd\'' }]
  };
  </code></pre>
  
  <p>however this is not working for me. Data is still being displayed as it is. Rather than  "2009-05-13" Anything i am doing wrong? Thanks in advance!</p>