zendesk/credit_card_sanitizer — pull request #16 by vkmita (2014-10-09 23:29:29+00:00)
Title: Use the ActiveMerchent luhn_check and brand methods

@ggrossman

This makes it so we use Shipify's beautiful activemerchent gem.

Should I add tests for the `brand?` method?
They are all here https://github.com/Shopify/active_merchant/blob/master/test/unit/credit_card_methods_test.rb