title: How to disable a UITableView from scrolling up vertically?
body: <p>I'm using <code>EGORefreshTableHeader</code> in conjunction with a static cell (defined in a nib) in a UITableView.  </p>
  
  <p>I'd like to be able to scroll the tableview down to trigger the <code>EGORefreshTableHeader</code> and thus refresh the data in the static cell. BUT, as the static cell is sized to fit perfectly in the window, I want to prevent folks from being able to scroll up.</p>
  
  <p>Is there a way to do this?</p>