Merge pull request #1 from brometeo/sequel-datasets

Mapper::Sequel now disables entities and got cleaned up
Entity < BaseEntity new definition DSL [sequel-datasets]
Merge with brometeo's changes [sequel-datasets]
Some new methods for BaseEntity id management. Unused for now.

On branch sequel-datasets
Merge branch 'sequel-datasets' of git://github.com/nandosola/sequel-uow into sequel-datasets

Conflicts:
	lib/base_entity.rb