- Add GetObservation streaming datasource for old concept.
- Refactor Hibernate observation related entity classes
  - move duplicate definitions to abstract classes
- Javadoc for new classes
Adapt checkCreateSchema() to remove further generated foreign keys and duplicated lines.
Adapt checkCreateSchema() to remove further generated foreign keys and duplicated lines.
- Update RELEASE-NOTES
- Set version from 4.0.2-SNAPSHOT to 4.1.0-SNAPSHOT (0.1.3-SNAPSHOT to 0.2.0-SNAPSHOT) because it contains new features and not only fixes.
Merge pull request #53 from CarstenHollmann/feature/streaming

Add streaming data support for the old concept and increase the current version