Braintree Blue Store does not follow standard arguments

[danwetherald]

When using the Braintree Blue gateway, typically the store will take the payment method nonce as the first argument and the options following that.

This causes issues for platforms that are using Active Merchant as a standard implementation for multiple gates where a "gateway" should be treated in a similar manner if it is a Braintree gateway or a Auth.net gateway.

All the unit and remote tests are only done by using Active Merchant credit cards and absolutely no concept of using client side card nonces to create new customer/cards on file using the store method.

[curiousepic]

Marking this "of interest" before a cleanup of stale issues

[github-actions]

To provide a cleaner slate for the maintenance of the library, this PR/Issue is being labeled stale after 60 days without activity. It will be closed in 14 days unless you comment with an update regarding its applicability to the current build. Thank you!