Revert Optimal encoding change
Merge pull request #1318 from Shopify/revert_optimal_encoding

Revert Optimal encoding change
Fix wirecard formatting warning
Revert net_registry URL encoding
Merge pull request #1329 from Shopify/fix_net_registry_encoding

Revert NetRegistry URL encoding
Worldpay should support HashWithIndifferentAccess
Review feedback
Merge pull request #1330 from Shopify/fix_worldpay_address

Worldpay should support HashWithIndifferentAccess
Prefix CVV failure messages
Review feedback
Merge pull request #1340 from Shopify/update_cvv_messages

Prefix CVV failure messages
Litle: Add verify support

Closes #1333.
USAePay: Add verify support

Closes #1332.
BridgePay: Add verify support

I don't see any zero dollar auth capability in BridgePay; underneath the
covers, we do a $1.00 auth followed by a void.

If the void fails, the overall transaction still succeeds (like the
verify operation for other gateways).  In BridgePay's case, this is
particularly useful since we've been told that some of BridgePay's
backend processors (like First Data Omaha) do not allow voids of
authorizations.

Closes #1321.