Remove .org parent folder structure

Flattening the folder structure for a bit easier auto-inclusion into
projects and local development.

See:
https://github.com/DevinVinson/WordPress-Plugin-Boilerplate/issues/295

plugin-name/includes/class-plugin-name-activator.php

@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * Fired during plugin activation
+ *
+ * @link       http://example.com
+ * @since      1.0.0
+ *
+ * @package    Plugin_Name
+ * @subpackage Plugin_Name/includes
+ */
+
+/**
+ * Fired during plugin activation.
+ *
+ * This class defines all code necessary to run during the plugin's activation.
+ *
+ * @since      1.0.0
+ * @package    Plugin_Name
+ * @subpackage Plugin_Name/includes
+ * @author     Your Name <email@example.com>
+ */
+class Plugin_Name_Activator {
+
+	/**
+	 * Short Description. (use period)
+	 *
+	 * Long Description.
+	 *
+	 * @since    1.0.0
+	 */
+	public static function activate() {
+
+	}
+
+}