title: NG-Grid Filter not working correctly
body: <p>I have a really basic grid using Angular.js and NG-GRID with the showFilter: set to true.
  However if I search for the value in the  Marketing Start Date Column, 200101011.  It doesn't show.  Actually as soon as I start typing a 2 in the filter text it should find all four records, but only 2 show up....
  Here's the Plnkr
  <a href="http://plnkr.co/edit/D3nFkQ" rel="nofollow">http://plnkr.co/edit/D3nFkQ</a>
  Thank you.</p>