title: Bind dynamic array to column headers
body: <p>How can I bind an array of changing data to the column headers?</p>
  
  <p>I have seen that sample: <a href="http://ui-grid.info/docs/#/tutorial/302_custom_header" rel="nofollow">http://ui-grid.info/docs/#/tutorial/302_custom_header</a></p>
  
  <p>but its just displaying static data. </p>
  
  <p>I need to bind the column headers to an array of date objects.</p>