Changed ResolverConfig to register a MappingConfig, a DataContext(including the DefaultConnection string), and a Repository, moved MappingConfig to its own file and deleted CustoDNRepository.cs, removed default constructor from Nexus (now it must be given an IRepository; that should be taken care of by Autofac), added A and An classes to CustoDN.Web that inherit from the ones in Domain, and added a few methods to A and An for use with tests.