adding more classes from old CRS
Removing an interface abstraction not needed at this time.  It can easily be recreated again if it becomes relevant
Making this class fluent
Adding a HttpProviderImpl that will actually talk to auth.net
Setting some authorize.net properties
create a class to transate our `Conference`,`Payment`,`Registration` objects into objects that know how to talk to authorize dot net
 - Use it in `RegistrationResource`