Added support for iPay88 integration
Swap service_url and entry_url to play nice with ActiveMerchant's payment_service_for view helper
swap entry and service url.
Ipay88 comment cleanup.
credentials are not set as class variables, change to pass the merchant key into initialize
Fix endpoint url, customer name
Fix a couple tests
Merge pull request #788 from Shopify/ipay88

Ipay88 integration