title: How can I get the height of a specific row in my UITableView
body: <p>In my <code>UITableView</code> i've set different heights for different rows using the delegate method: <code>tableView:heightForRowAtIndexPath:</code></p>
  
  <p>Now given a <code>NSIndexPath</code>, I would like to get the height I've previously assigned for a specific row.</p>