Upgraded NUnit framework library from 2.6.2 to 2.6.3.
Updated AssemblyInfo files for Eithery.Core and its unit test projects.
Reviewed and updated a bit DisplayNameAttribute class and its unit tests.
Renamed DomainObjectAttribute class to DomainEntityAttribute. Corrected all refs. Renamed IsDomainObject property of TypeExtensions to IsDomainEntity accordingly.
Updated FinderAttribute and InvariantAttribute classes.
Reviewed and updated Country value type. Added Kosovo.
Reviewed and updated USState value type and its unit tests.