DATAREST-423 - Fixed HandlerAdapterSetup to consider ConversionService.

The special RepositoryRestHandlerAdapter we set up for repository invocations didn't consider the ConversionService Spring Data REST sets up. This causes binding issues in case someone wants to override resource handling by declaring an @RepositoryRestController and using a domain type as handler method argument.

We now explicitly configure the RepositoryRestHandlerAdapter to use the ConversionService we set up and equip with Spring Data Commons' DomainClassConverter.