Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/zendframework/zend-feed/src/PubSubHubbub/Model/AbstractModel.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @link      http://github.com/zendframework/zf2 for the canonical source repository
+ * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   http://framework.zend.com/license/new-bsd New BSD License
+ */
+
+namespace Zend\Feed\PubSubHubbub\Model;
+
+use Zend\Db\TableGateway\TableGateway;
+use Zend\Db\TableGateway\TableGatewayInterface;
+
+class AbstractModel
+{
+    /**
+     * Zend\Db\TableGateway\TableGatewayInterface instance to host database methods
+     *
+     * @var TableGatewayInterface
+     */
+    protected $db = null;
+
+    /**
+     * Constructor
+     *
+     * @param null|TableGatewayInterface $tableGateway
+     */
+    public function __construct(TableGatewayInterface $tableGateway = null)
+    {
+        if ($tableGateway === null) {
+            $parts = explode('\\', get_class($this));
+            $table = strtolower(array_pop($parts));
+            $this->db = new TableGateway($table, null);
+        } else {
+            $this->db = $tableGateway;
+        }
+    }
+}