remove AVS and CSC from Balanced gateway until supported in the API
Clean up Paxum tests

Some of the Paxum tests had copy/paste references to Robokassa.

Hopefully fixes the issues noted by @csaunders in #418.
Merge pull request #419 from balanced/master

Balanced gateway: Remove AVS + CVC

AVS and CVC are not currently supported by the Balanced API.
Add rake task to verify SSL certificates
Worldpay: Fix refund

The wrong response status "AUTHORISED" was assumed when making inquiry request
before refunding. Each request can now specify its own success criteria.

Closes #423
Worldpay: Test refunds

Make sure inquire requests does not fail when Worldpay returns 'last event'
other than "AUTHORISED" which is the case when refunding as the payment must be
in the "CAPTURED" state before attempting refunds.
Wirecard gateway: always capture GuWID

The "authorization" for a transaction should always be captured, even if
the transaction is not specifically an authorization. In Wirecard's case
this is the GuWID, and can be used to reference a particular transcation
even if it is not an authorization transaction.
UsaEpay gateway: #test? method should be public
Add PxPay integration
Worldpay: updated urls and supported card types
Worldpay: Comment out remote refund tests since it takes some time for the transaction to move states

This can be tested by capturing a transaction, recording the auth code
and then attempting the refund awhile later.
Merge branch 'bug/worldpay_refund_423'
Move litle require to initialize, if you're not using it you don't need
the gem.
Bump for release
Allow setting test mode per transaction for litle
PayPal Express: Support non standard locale codes for checkout language in e.g. Japanese and Hebrew
Add Banwire gateway

http://www.banwire.com/
Authorize.Net CIM: Move cardCode after order

The Authorize.net XSD requires that order come before cardCode.

Closes #425.
Add WebMoney integration

http://www.webmoney.ru

Closes #444.
EasyPay: Make symmetric with other integrations

Closes #432.