Created repository exception.
Implemented steward entity.
Steward DAO interface.
Spring, JPA, hibernate, junit dependencies.
Downgrade JPA implementation version from 2.1 to 2.0.
Create tables for test purpose
Spring configuration context.
JPA entity annotations.
DAO dummy implementation.
Added parametric constructors.
Update javadoc.
toString method added.
Implemented StewardDAO.
BaseDAO abstract class.