Patch amz ord 1

[orenlande]

Sorry for late PR, was completely forgot about it. Referring to the issue at https://github.com/keithbrink/amazon-mws-laravel/issues/31.

Next step would to add some more useful docs to the readme.

[keithbrink]

I'm going to close this PR in favour of getting the data like so:

$order_list = new AmazonOrderList(....);
...
$order_list->getList();
foreach($order_list as $order) {
    $order_data = $order->getData();
}