OGM-646 Add test for unidirectional @OneToMany
OGM-646 Fix NullPointerException in MongoDB for unidrectional one-to-many
OGM-606 Rename test in OneToOneTest
OGM-606 Add JPA mapping example to MongoDB documentation
OGM-606 Neo4j images used in the documentation
OGM-606 Add JPA mapping example in Neo4j documentation
OGM-606 Update CouchDB documentation