Remove useless DAO.
Remove sample items file.
Fix value into README.md
Fix volume discount calculus.
Fix discount rounds.
Add EntityManger and EntityMangerFactory injection for service and dao
Add proxy adapter for service that use multiple dao into transaction
(not yet supported).
Fix entity bill -> basketItem relation.
Add new test for service/dao.
Add fonts and fix css styles.
Fix BillViewer to calculate correct discount%
Add bill history page (master-detail).
Add a PersistentManager to handle persistent into web project, no direct
knowledge of service into UI.