total improvements

[ZAYEC77]

Hello, please, check out my PR, I tried to improve package in general.
Particularly, error handling and data types mapping.
Now it allows to write migration like:

    public function up()
    {
        $this->createTable('product', [
            'product_id' => $this->bigInteger(),
            'guid' => $this->bigInteger()->unsigned(),
            'active' => $this->boolean(),
        ]);
    }