修复seeder错误；删除第三方的think迁移工具，在extend中重新实现；

extend/think/migration/command/migrate/Create.php

@@ -0,0 +1,55 @@
+<?php
+// +----------------------------------------------------------------------
+// | TopThink [ WE CAN DO IT JUST THINK IT ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2016 http://www.topthink.com All rights reserved.
+// +----------------------------------------------------------------------
+// | Author: zhangyajun <448901948@qq.com>
+// +----------------------------------------------------------------------
+
+namespace think\migration\command\migrate;
+
+use InvalidArgumentException;
+use RuntimeException;
+use think\console\Command;
+use think\console\Input;
+use think\console\input\Argument as InputArgument;
+use think\console\Output;
+use think\migration\Creator;
+
+class Create extends Command
+{
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this->setName('migrate:create')
+            ->setDescription('Create a new migration')
+            ->addArgument('name', InputArgument::REQUIRED, 'What is the name of the migration?')
+            ->setHelp(sprintf('%sCreates a new database migration%s', PHP_EOL, PHP_EOL));
+    }
+
+    /**
+     * Create the new migration.
+     *
+     * @param Input  $input
+     * @param Output $output
+     * @return void
+     * @throws InvalidArgumentException
+     * @throws RuntimeException
+     */
+    protected function execute(Input $input, Output $output)
+    {
+        /** @var Creator $creator */
+        $creator = $this->app->get('migration.creator');
+
+        $className = $input->getArgument('name');
+
+        $path = $creator->create($className);
+
+        $output->writeln('<info>created</info> .' . str_replace(getcwd(), '', realpath($path)));
+    }
+
+}