[added] Komea Entity model
[model] refactoring
[added] komea db viz using graph stream
Merge branch 'sprint' of https://github.com/sleroy/komea into sprint

Conflicts:
	core/shared/komea-db-commons/src/main/java/org/komea/core/model/services/impl/OrientGraphStorageService.java
	core/shared/komea-db-commons/src/main/java/org/komea/orientdb/session/impl/OrientGraphDatabaseFactory.java
	core/shared/komea-db-commons/src/test/java/org/komea/core/model/services/tests/OrientdbStorageServiceTests.java
	settings.gradle