title: jQuery Sortable - no dragging past last list item
body: <p>I have an unsorted list (<code>UL</code>) that contains sortable list items (<code>LI</code>), except for the last list item. I need the last item to stay at the end of the list:</p>
  
  <pre><code>&lt;ul&gt;
      &lt;li&gt;Item 1&lt;/li&gt;
      &lt;li&gt;Item 2&lt;/li&gt;
      &lt;li&gt;Item 2&lt;/li&gt;
      &lt;li&gt;Last item&lt;/li&gt;&lt;!-- Should always be the last item --&gt;
  &lt;/ul&gt;
  </code></pre>
  
  <p>I'm using <a href="http://jqueryui.com/demos/sortable">jQuery Sortable</a> for sorting the list items.</p>
  
  <p>Does anyone know a good way to prevent list items from being dragged past the last list item?</p>