- Added new model "SubscriberList"

- Added has_many_through relations to the new model + Subscriber model
- Added tests
- Fixed syntax in other models
This closes #95

lib/Models/Subscriber.php

@@ -1,7 +1,7 @@
 <?php
 namespace MailPoet\Models;
 
-if (!defined('ABSPATH')) exit;
+if(!defined('ABSPATH')) exit;
 
 class Subscriber extends Model {
   public static $_table = MP_SUBSCRIBERS_TABLE;
@@ -14,4 +14,8 @@ class Subscriber extends Model {
       'isEmail' => __('Your email address is invalid.')
     ));
   }
+
+  public function lists() {
+    return self::has_many_through(__NAMESPACE__ . '\SubscriberList', __NAMESPACE__ . '\PivotSubscriberList', 'subscriber_id', 'list_id');
+  }
 }