Integrate DOSS
Sequence is dead code. We now let the Blueprints layer generate ids.
Remove Frames workaround for addVertex Annotation bug

I've put a workaround in AmberDb.OwnedGraph so we don't need to
do it`here anymore.
Merge pull request #16 from nla/doss

Integrate DOSS
Looks good - i'll try to start filling out the transaction methods of AmberDb soon.