Allow developers to access the Order resource

[stevebrownlee]

Feature Criteria

Verbs to be supported

1. GET
2. POST
3. PUT
4. DELETE

• User should be able to GET a list, and GET a single item.
• When an order is deleted, every line item (i.e. entry in OrderProduct) should be removed
• Should be able to filter out completed orders with the ?completed=false query string parameter. If the parameter value is true, then only completed order should be returned.
• If the query string parameter of ?_include=products is in the URL, then the list of products in the order should be returned.
• If the query string parameter of ?_include=customers is in the URL, then the customer representation should be included in the response.

Testing Criteria

Write a testing class and test methods that validate the GET, POST, PUT, and DELETE operations work as expected.

[copypastedeveloper]

This issue was moved to nss-evening-cohort-7#4