Fix for issue 272 internal interface from signed assembly

[a-powolozki]

As mentioned in the issue 272 when you try to instantiate a service for an internal interface the check is perfomed, if the assembly of the interface has an InternalsVisibleTo(RestClient.FactoryAssemblyName) attribute.

Additionally to present check for presense of the InternalsVisibleTo(RestClient.FactoryAssemblyName) check if InternalsVisibleTo(RestClient.FactoryAssemblyName + ', PublicKey=') exists