title: IntegerColumn not available in GWT?
body: <p>I am new to GWT and  I am trying to make a simple table in GWT.
  The table has string and integer types.
  However, GWT  has only TextColumns which returns only Strings.</p>
  
  <p>But there is no "IntegerColumns" which returns Integers, so what's the easiest way to design it ?</p>
  
  <p>Right now I convert Integers to Strings but this solution is not suitable for sorting the columns. </p>