update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/API/Renderer/Json2.php

@@ -0,0 +1,33 @@
+<?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\API\Renderer;
+
+use Piwik\Piwik;
+
+/**
+ * Correct API output renderer for JSON. Includes bug fixes for bugs in the old JSON API
+ * format.
+ */
+class Json2 extends Json
+{
+    public function renderArray($array)
+    {
+        $result = parent::renderArray($array);
+
+        // if $array is a simple associative array, remove the JSON root array that is added by renderDataTable
+        if (!empty($array)
+            && Piwik::isAssociativeArray($array)
+            && !Piwik::isMultiDimensionalArray($array)
+        ) {
+            $result = substr($result, 1, strlen($result) - 2);
+        }
+
+        return $result;
+    }
+}