* Document the C::A::C::Password stuff properly
* Work out what options inherited from C::A::C::Password make sense, and
  test / document them + make apply to digest as appropriate.
. Port work's apps.
. Document how to find the credential module, so that you can call authorization_required_response if you want to.
. Document, and test overriding the realm's realm->name method.
. Add deprecation notice to old module.
. Test $self->_config->{authorization_required_message} + authorization_required_message = undef does not stamp on body.
. Split auth headers / do auth methods again, and make authenticate call each in turn.
. Document / test 'algorithm' config.
. Test and document use_uri_for config