* roll back before deleting indexes
Revert "* implement a (node)size function of in the database abstraction"

This reverts commit c3d51982f18362835622914758b6a35417b6ba0e.

Conflicts:
	db/neo4j/src/neo4j/EmbeddedNeo4jWithIndexing.java
	db/neo4j/src/neo4j/Neo4jDBClient.java
* Implemented
	inviteFriend
* Retrieve getInitialStates()
* Retrieve size function at the db abstraction class