title: enable bouncing for only one direction UITableView
body: <p>How would I go about allowing a <code>UITableView</code> to bounce when it reaches the bottom, but not the top. Essentially I'm adding a <code>UIImageView</code> as my <code>TableView's</code> section header, but currently if I pull up at the top there's an ugly space between my <code>UIImageView</code> and my <code>UINavigationBar</code>.</p>
  
  <p>I look at this <a href="https://stackoverflow.com/questions/17166983/uitableview-bounce-bottom-edge-only">question</a> but I don't really understand the solution. Would somebody mind elaborating? </p>