Add a method to retrieve the last raw response

[lenvanessen]

Overview/summary

We can't really easily get to the headers that tell us how our api-call limits are doing. It would be really beneficiary to access those. Given the scopes of some of the methods on the Base class it's really difficult to achieve this by extending or overriding methods in the class.

Motivation

We need to know when to reduce our API calls in order to create an efficient usage of the API.

[paulomarg]

Hey, thanks for raising this. We can look into returning the response details as well, adding this to our tracking.