update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/VisitorInterest/Menu.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+namespace Piwik\Plugins\VisitorInterest;
+
+use Piwik\Menu\MenuReporting;
+
+class Menu extends \Piwik\Plugin\Menu
+{
+    public function configureReportingMenu(MenuReporting $menu)
+    {
+        $menu->rename('General_Visitors', 'VisitFrequency_SubmenuFrequency',
+                      'General_Visitors', 'VisitorInterest_Engagement');
+    }
+}