update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/Referrers/Widgets.php

@@ -0,0 +1,24 @@
+<?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\Referrers;
+
+use Piwik\SettingsPiwik;
+
+class Widgets extends \Piwik\Plugin\Widgets
+{
+    protected $category = 'SEO';
+
+    public function init()
+    {
+        if (SettingsPiwik::isSegmentationEnabled()) {
+            $this->addWidget('Referrers_WidgetTopKeywordsForPages', 'getKeywordsForPage');
+        }
+    }
+
+}