i05t05: Database manager (Lionfish) enhancement

Lionfish (formerly ODM) has been enriched
with multiget and multiset. Unit tests have
not been completed yet.
i05t06: Database manager (Lionfish) tests

The unit tests have been added.
i05t05: Database manager (Lionfish) enhancement

The code has been cleaned up. Some functionalities
of the Lionfish server have been fixed.
i05t06: Database manager (Lionfish) tests

Basic performance tests have been added.
Some files have been reorganised.
i05t05: Database manager (Lionfish) enhancement

The bugs mentioned in the pull request have been fixed.
Neo4j graph has been enhanced with labels. The performance
have increased.
Merge pull request #88 from bziiuj/lionfish

Lionfish
Starting merging with lionfish
Merge branch 'dev' into ocean_don_corleone

Conflicts:
	graph_workers/odm_client.py
	odm_server.py
	tests/tmp_tests_odm_server.py