Added firsts SaleService tests.
Just have started working on ContactsFetchResource implementation
Preparation for more ProductService tests.
Added a few integration tests for ProductServiceImpl
Added integration tests for RoleServiceImpl, SaleServiceImpl and ProductServiceImpl.
Added missing tests for UserServiceImpl
Added missing part in UserServiceImpl.deleteRoles
Some fixes for javadocs
Added some WS skeletons, docs,
Added web-gui module, some docs new entities