Accept an ActiveMerchant::Billing::Response when storing a credit card for Balanced

Changed handling in create_profile for Balanced to accept an ActiveMerchant response with the card_uri and account_uri in authorization

Please see ActiveMerchant pull request: https://github.com/Shopify/active_merchant/pull/889

When this is pulled in to ActiveMerchant, my changes to Spree gateway can be pulled.