Merge pull request #101 from BluWings/master

#100 fix OSGi meta data
upgraded to Neo4j 2.0.2
Merge remote-tracking branch 'origin/master'
#102 implemented Neo4j provider which reuses an existing GraphdatabaseService
#102 extended test and fixed datastore factory
#103 support for void as return type for @ResultOf methods
#94 added label cache to Neo4j datastore