Fix "Uncaught TypeError" in ui.autocomplete. 

Because certain naming conventions relating to autocomplete have been removed in jQuery UI v1.10, the `autocomplete` data tag has been renamed to `ui-autocomplete`, and the `item.autocomplete` has been renamed to `ui-autocomplete-item`.

see: http://jqueryui.com/upgrade-guide/1.10/#autocomplete

and this question: http://stackoverflow.com/questions/9513251/cannot-set-property-renderitem-of-undefined-jquery-ui-autocomplete-with-html