Error when relationships are arrays.

[kevdowney]

Installed v1.0.0

 codesleeve/fixture                v1.0.0             A framework agnostic, simple (yet elegant) fixture library for php.
 codesleeve/fixture-l4             dev-master 23db25b A simple, easy to use fixture library for Laravel 4

ErrorException: explode() expects parameter 2 to be string, array given

/api/vendor/codesleeve/fixture/src/Codesleeve/Fixture/Drivers/Eloquent.php:147
/api/vendor/codesleeve/fixture/src/Codesleeve/Fixture/Drivers/Eloquent.php:113
/api/vendor/codesleeve/fixture/src/Codesleeve/Fixture/Drivers/Eloquent.php:71
/api/vendor/codesleeve/fixture/src/Codesleeve/Fixture/Fixture.php:312
/api/vendor/codesleeve/fixture/src/Codesleeve/Fixture/Fixture.php:289
/api/vendor/codesleeve/fixture/src/Codesleeve/Fixture/Fixture.php:252
/api/vendor/codesleeve/fixture/src/Codesleeve/Fixture/Fixture.php:203
/api/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php:208

fixtures/assets.php

return array(
    'asset_1' => array(
        'account' => 'account_1',
        'url' => 'https://example.com/images/image1.jpg',
        'name' => 'image1.jpg',
        'type' => 'image',
    ),
    'asset_2' => array(
        'account' => 'account_1',
        'url' => 'https://example.com/images/image2.jpg',
        'name' => 'image2.jpg',
        'type' => 'image',
    ),
);

fixtures/products.php

return array(
    'product_2_service' => array(
        'type' => 'service',
        'name' => 'Test Service Product 2',
        'description' => 'Qui aliquid magni laborum et aliquam. Nesciunt ut reiciendis libero architecto aliquid atque maiores. Placeat cum incidunt omnis tempore qui.',
        'sku' => 'TEST_SKU-SERVICE-00002',
       ...
        'assets' => 'asset_1,asset_2'  // OK
       ...
        'assets' => array('asset_1', 'asset_2')  // ERROR
    ),
);

Your documentation says to use arrays for these many relationships, so either we should update the documentation or fix this to support array relationships?