First fake subscriber model to show namespacing and autoloading.

lib/models/subscriber.php

@@ -0,0 +1,11 @@
+<?php namespace MailPoet\Models;
+if (!defined('ABSPATH')) exit;
+
+class Subscriber {
+
+  public $name;
+
+  public function __construct () {
+    $this->name = 'First Subscriber';
+  }
+}