Apply change from #279 to 2.0

• The Happyr\DoctrineSpecification\EntitySpecificationRepository class was removed, use
  Happyr\DoctrineSpecification\Repository\EntitySpecificationRepository instead.
• The Happyr\DoctrineSpecification\EntitySpecificationRepositoryInterface class was removed, use
  Happyr\DoctrineSpecification\Repository\EntitySpecificationRepositoryInterface instead.
• The Happyr\DoctrineSpecification\EntitySpecificationRepositoryTrait class was removed, use
  Happyr\DoctrineSpecification\Repository\EntitySpecificationRepositoryTrait instead.
• The Happyr\DoctrineSpecification\RepositoryFactory class was removed, use
  Happyr\DoctrineSpecification\Repository\RepositoryFactory instead.