Discovered many problems with the abstractions along the way
and did small fixes to get to the end of the auth module.
- Use more constants for random strings
- Create forcing functions to deal with the upgrades to different
interfaces
In order to support multiple different types of requests, there needed
to be an interface to be able to read values from a request, and
subsequently validate them to return any errors.
So we've adjusted the Validator interface to no longer validate a
request but instead validate the object it lives on.
And we've created a new BodyReader interface.
