update Piwik to version 2.16 (fixes #91)

www/analytics/vendor/piwik/cache/src/Backend/Redis.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/lgpl-3.0.html LGPL v3 or later
+ *
+ */
+namespace Piwik\Cache\Backend;
+
+use Doctrine\Common\Cache\RedisCache;
+use Piwik\Cache\Backend;
+
+class Redis extends RedisCache implements Backend
+{
+    public function doFetch($id)
+    {
+        return parent::doFetch($id);
+    }
+
+    public function doContains($id)
+    {
+        return parent::doContains($id);
+    }
+
+    public function doSave($id, $data, $lifeTime = 0)
+    {
+        return parent::doSave($id, $data, $lifeTime);
+    }
+
+    public function doDelete($id)
+    {
+        return parent::doDelete($id);
+    }
+
+    public function doFlush()
+    {
+        return parent::doFlush();
+    }
+
+}