update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/CorePluginsAdmin/javascripts/pluginOverview.js

@@ -1,5 +1,5 @@
 /*!
- * Piwik - Web Analytics
+ * Piwik - free/libre analytics platform
  *
  * @link http://piwik.org
  * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
@@ -34,4 +34,12 @@ $(document).ready(function () {
         });
     });
 
+    $('.plugin-donation-link').click(function (event) {
+        event.preventDefault();
+
+        var overlayId = $(this).data('overlay-id');
+
+        piwikHelper.modalConfirm('#'+overlayId, {});
+    });
+
 });