Adds a few unit tests - experimenting with the PluginManager
Corrects erroneous error message
TaxationGatewayProviderResolver
Updated to Umbraco 7.1 nightly 257.  More work on resolvers
Optionally Encrypts extended data on GatewayProvider
Resolvers to start testing concept.  Will be refactored.
#M-195 Fixed
Refactors CashPaymentGatewayMethod to implement new PerformVoidPayment abstract method.
Merge pull request #508 from rustyswayne/1.0.1

Adds Void Payment abstract to PaymentGatewayMethodBase and implements in CashPaymentGatewayMethod.