Move people tag autocomplete JS to plugin

As discussed in https://gitorious.org/social/mainline/merge_requests/47

js/util.js

@@ -1562,60 +1562,6 @@ var SN = { // StatusNet
             });
         },
 
-        /**
-         * Called when a people tag edit box is shown in the interface
-         *
-         * - loads the jQuery UI autocomplete plugin
-         * - sets event handlers for tag completion
-         *
-         */
-        PeopletagAutocomplete: function (txtBox) {
-            var split = function (val) {
-                return val.split( /\s+/ );
-            }
-            var extractLast = function (term) {
-                return split(term).pop();
-            }
-
-            // don't navigate away from the field on tab when selecting an item
-            txtBox.on( "keydown", function ( event ) {
-                if ( event.keyCode === $.ui.keyCode.TAB &&
-                        $(this).data( "ui-autocomplete" ).menu.active ) {
-                    event.preventDefault();
-                }
-            }).autocomplete({
-                minLength: 0,
-                source: function (request, response) {
-                    // delegate back to autocomplete, but extract the last term
-                    response($.ui.autocomplete.filter(
-                        SN.C.PtagACData, extractLast(request.term)));
-                },
-                focus: function () {
-                    return false;
-                },
-                select: function (event, ui) {
-                    var terms = split(this.value);
-                    terms.pop();
-                    terms.push(ui.item.value);
-                    terms.push("");
-                    this.value = terms.join(" ");
-                    return false;
-                }
-            }).data('ui-autocomplete')._renderItem = function (ul, item) {
-                    // FIXME: with jQuery UI you cannot have it highlight the match
-                    var _l = '<a class="ptag-ac-line-tag">' + item.tag
-                          + ' <em class="privacy_mode">' + item.mode + '</em>'
-                          + '<span class="freq">' + item.freq + '</span></a>'
-
-                    return $("<li/>")
-                            .addClass('mode-' + item.mode)
-                            .addClass('ptag-ac-line')
-                            .data("item.autocomplete", item)
-                            .append(_l)
-                            .appendTo(ul);
-                }
-        },
-
         /**
          * Run setup for the ajax people tags editor
          *
@@ -1644,7 +1590,6 @@ var SN = { // StatusNet
                         }
 
                         SN.C.PtagACData = data;
-                        SN.Init.PeopletagAutocomplete(form.find('#tags'));
                     }
                 });