update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/Overlay/Overlay.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Piwik - Open source 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
@@ -9,21 +9,12 @@
 
 namespace Piwik\Plugins\Overlay;
 
-
 class Overlay extends \Piwik\Plugin
 {
-    public function getInformation()
-    {
-        $suffix = ' Note: Requires the Transitions plugin enabled.';
-        $info = parent::getInformation();
-        $info['description'] .= ' ' . $suffix;
-        return $info;
-    }
-
     /**
-     * @see Piwik\Plugin::getListHooksRegistered
+     * @see Piwik\Plugin::registerEvents
      */
-    function getListHooksRegistered()
+    function registerEvents()
     {
         return array(
             'AssetManager.getJavaScriptFiles'        => 'getJsFiles',