A base test class that can be extended by other tests to include utility methods. API docs: https://github.com/mozilla/personatestuser.org#api
Usage: verified = bool: Verified refers to the user's account and password already approved and set up
env = str: Strings "dev", "stage" or "prod" will return users for the respective environments If "None" a production Persona user will be returned.
env = dict: For custom browserid databases and verifiers self.user = PersonaTestUser().create_user(verified=True, env={"browserid":"firefoxos.persona.org", "verifier":"firefoxos.123done.org"})