update Piwik to version 2.16 (fixes #91)

www/analytics/core/ProxyHeaders.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
@@ -8,7 +8,6 @@
  */
 namespace Piwik;
 
-
 /**
  * Proxy headers
  *
@@ -22,10 +21,6 @@ class ProxyHeaders
      */
     public static function getProtocolInformation()
     {
-        if (Common::getRequestVar('clientProtocol', 'http', 'string') == 'https') {
-            return 'https';
-        }
-
         if (isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == 443) {
             return 'SERVER_PORT=443';
         }