Updates to 3rd party libraries

Add Dockerfile and specific docker-php.ini

inc/vendor/phpoffice/phpspreadsheet/tests/bootstrap.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * @copyright   Copyright (C) 2011-2014 PhpSpreadsheet. All rights reserved.
+ * @author      Mark Baker
+ */
+chdir(__DIR__);
+
+setlocale(LC_ALL, 'en_US.utf8');
+
+// PHP 5.3 Compat
+date_default_timezone_set('Europe/London');
+
+require_once __DIR__ . '/../src/Bootstrap.php';