Updated metadata and entity services to more easily support interacting with related objects to a given object.
 - Added saveAll method to repository to save an entity and related objects in a single transaction.
 - Updated the test names to reflect the rename of the services.
 - Added tests for related object operations (retire, unretire, void, unvoid).  Tests not yet implemented.
Added additional tests for the entity data service.  Fixes #33.
	- Created tests for IEntityDataService
	- Added documentation for PagingInfo
	- Removed related object tests as these will need to be a part of the implementation-specific tests