Releases focus around Basic Shopify API. An oversight on my part, I forgot to include ability to iterate over the custom object. So now, you're able to iterate and count over the ResponseAccess.

Basic Shopify API

+ Implemented `Iterable` and `Countable` on `ResponseAccess`

+ Added methods `keys` and `values` to allow for getting keys and values easier

+ Add JSON serialize method

Laravel Shopify

+ Updated code for APIHelper to account for new underlying API changes (array to ResponseAccess), solves #502