Expose transaction errors on transaction
Expose transaction errors on transaction

This fixes #79.

Signed-off-by: Stephen Celis <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@stephencelis.com>

SupportPay/RecurlyDemoNew,SupportPay/recurly-ruby,SupportPay/RecurlyDemoNew,SupportPay/recurly-ruby