title: Right CellIdentifier for the cell in UITableView
body: <p>Can someone explain the difference between </p>
  
  <pre><code>static NSString* CellIdentifier = @"Cell";
  </code></pre>
  
  <p>and </p>
  
  <pre><code>NSString *CellIdentifier = [NSString stringWithFormat: @"Cell%i", indexPath.row];
  </code></pre>
  
  <p>When should I use the first one and where the second?</p>