lyang/braintree-rails — pull request #4 by n0nick (2013-04-02 15:33:13+00:00)
Title: Add CreditCards number, cvv fields as updateable 

Since Braintree allows for these fields to be part of a call to
update credit cards, I don't see a reason to leave them out.

This way, we're able to simulate a one-to-one Customer-CreditCard
relation without diving into complex delete-and-create logic.