title: Additional Parameter when using jqueryui's auto complete
body: <p>I'm looking to add an additional parameter to a jquery UI auto complete request without having to nest the json return in an ajax call. I would envision something like the following working, however the data: option is not passed over to the ajax request like it is on a normal jquery ajax request.</p>
  
  <pre><code> $("#div").autocomplete({
          source: 'ajax.php',
          minLength: 2,
          data: '&amp;action=getUserName',
          select: function( event, ui ) {
              log( ui.item ?
                  "Selected: " + ui.item.value + " aka " + ui.item.id :
                  "Nothing selected, input was " + this.value );
          }
  });
  </code></pre>
  
  <p>tl;dr I need help passing <code>&amp;action=getUserName</code> over to the ajax for my autocomplete, preferably without nesting it in an ajax callback.</p>