ORM (Hibernate) introduced, main services too.

TODO: 

- Web User (From Eperson)
- Configure Hibernate
- Implement service interfaces
Security re-structured (authentication and authorization)
Context service and class implemented.
Configuration Service set to use unified property management system
Basic watch for configuration file changes service implemented.
Authentication based on username/password implemented.
Configuration service centralized.
Main package changed
Configuration moved to one file only
Merge branch 'master' of https://github.com/lyncode/dspace-springui