add piwik installation

www/analytics/plugins/MobileMessaging/APIException.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ * Piwik - Open source web analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+
+namespace Piwik\Plugins\MobileMessaging;
+
+use Exception;
+
+/**
+ */
+class APIException extends Exception
+{
+
+}