- Renamed Model to BaseModel (make it clear)

- Updated RoboFile to compile assets or else tests break

lib/Models/Model.php

@@ -1,18 +0,0 @@
-<?php
-namespace MailPoet\Models;
-
-if (!defined('ABSPATH')) exit;
-
-class Model extends \Sudzy\ValidModel {
-  function __construct() {
-    $customValidators = new CustomValidator();
-    parent::__construct($customValidators->init());
-  }
-
-  function save() {
-    if ($this->created_at === null) {
-      $this->created_at = date("Y-m-d H:i:s");
-    }
-    parent::save();
-  }
-}