initial sabre upgrade (needs lots of work - to wit: authentication, redo the browser interface, and rework event export/import)

vendor/sabre/vobject/lib/InvalidDataException.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Sabre\VObject;
+
+/**
+ * This exception is thrown whenever an invalid value is found anywhere in a
+ * iCalendar or vCard object.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class InvalidDataException extends \Exception {
+}