Add upstream plugins

Signed-off-by: Adrian Nöthlich <git@promasu.tech>

wp-content/plugins/all-in-one-event-calendar/app/model/meta-post.php

@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * Post meta entries management.
+ *
+ * Meta entries management based on {@see Ai1ec_Meta} class.
+ *
+ * @author     Time.ly Network, Inc.
+ * @since      2.0
+ * @package    Ai1EC
+ * @subpackage Ai1EC.Model
+ */
+class Ai1ec_Meta_Post extends Ai1ec_Meta {
+
+}