Is would be nice to have a utility method like `is_active?` on the Subscription object. For example, to check if a subscription is active we now write: ```ruby payment_method.subscriptions.any? do |subscription| subscription.status == Braintree::Subscription::Status::Active end ``` It would improve our code if that could be replaced by something like `payment_method.subscriptions.any?(&:is_active?)`