allowFreeTagging set to false not work fix

Original allowFreeTagging set to false not work, when set
allowFreeTagging to false, user press COMMA or ENTER the free tag will
be added, this behavior is not "allowFreeTagging : false", should be
fix.

Author: fukuball

src/jquery.tokeninput.js

@@ -333,7 +333,11 @@ $.TokenList = function (input, url_or_data, settings) {
                     add_token($(selected_dropdown_item).data("tokeninput"));
                     hidden_input.change();
                   } else {
-                    add_freetagging_tokens();
+                    if ($(input).data("settings").allowFreeTagging) {
+                      add_freetagging_tokens();
+                    } else {
+                      $(this).val("");
+                    }
                     event.stopPropagation();
                     event.preventDefault();
                   }