Added Integration Tests

Created the following integration tests
  t/integration/01-authorization.t
  t/integration/02-authorization_reversal.t
  t/integration/03-capture.t
  t/integration/04-sale.t
  t/integration/05-follow_on_credit.t

All tests perform the specified operation and several variants of it
(such as a Succesful Auth vs a Declined Auth) for all four major credit
card types (Amex, Visa, MasterCard, and Discover)
Implemented Support for Electonic Verification Fields

When making Authorization requests for American Express, CyberSource
will responde with Electronic Verification Information.  This introduces
support for them.

In Business::CyberSource::Response::Role::ElectronicVerification
  Added the ev attributes

In Business::CyberSource::ResponsePart::AuthReply
  Modified to consume the
  Business::CyberSource::Response::Role::ElectronicVerification role

In MooseX::Types::CyberSource
  Added ElectronicVerificationResult type that contains the possible
  mapped values.