title: Add empty (blank) space under (in the end of) UITableView
body: <p>My app has the <code>UITableView</code> which have variable quantity of cells inside.</p>
  <p>How can I add empty (blank) space with certain height under the <code>UITableView</code>? Or in the very end of <code>UITableView</code>? So that after the very last cell there will be more blank space.</p>