NewDriver takes a base URL for an Engine Yard API and a token, returning a Driver that can be used to interact with the API in question.

Forbidden indicates that the authenticated user is not allowed to access a given Resource or API endpoint.

IllegalOperation is used to express that an attempted operation on the upstream API is not allowed.

NotFound indicates that the Resource upon which the client is operating was not found.

Driver is an object that knows specifically how to interact with the Engine Yard API at the HTTP level.