Adding support to remove a relationship via CypherBuilder.
Also ensuring redundant cypher isn't produced when properties/labels aren't set.
Merge branch 'master' of github.com:graphaware/neo4j-ogm
Introducing basic relationship management and relationship deletion.
Merge branch 'master' of github.com:graphaware/neo4j-ogm

Resolved conflicts:
	neo4j-ogm/src/main/java/org/neo4j/ogm/mapper/ObjectToCypherMapper.java