#37: Basic synchronization works including simple unit tests.
#37: Relationen are being synchronisiert. Unit tests for OneToOne and OneToMany relations synchronization.
Added synchronize test for many to many relation.
Updates are now rejected, when the object in the DB is newer than our last sync of that object.
Added synchronization points to onetoonerelation test to make test correct again.
Reenabled tests.
merge