Incorrect determining of default value for column

[sergeyklay]

How to reproduce:

use Phalcon\Db\Adapter\Pdo\Mysql;
use Phalcon\Db\Column;

$connection = new Mysql([
    'host'       => 'localhost',
    'username'   => 'root',
    'password'   => '',
    'dbname'     => 'devtools_issue_429',
    'port'       => '',
    'persistent' => true,
    'options'    => [
        PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'UTF8'",
        PDO::ATTR_CASE               => PDO::CASE_LOWER
    ],
]);

$column = new Column('status', [
    'type'    => Column::TYPE_INTEGER,
    'notNull' => true,
    'size'    => 1,
    'default' => 0
]);

$connection->createTable('user', '', ['columns' => [$column]]);

actual

CREATE TABLE `user` (
  `status` int(1) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8

expected

CREATE TABLE `user` (
  `status` int(1) NOT NULL DEFAULT '0'
) ENGINE=InnoDB DEFAULT CHARSET=utf8

[sergeyklay]

Refs phalcon/phalcon-devtools#429