GlobalIris: support CreditCard.cardholders_name in auth requests
Tests: skip WorldPay tests if insufficient configuration
GlobalIris: added support for 3 additional pieces of data that can be sent to RealAuth

Includes docs and tests
GlobalIris: Added support for strange address 'code' needed for AVS checks
Merge pull request #102 from spookylukey/global_iris_fixes

Global iris fixes