Updated for Play Framework 2.1.3 and OrientDB 1.5.0

Removed GraphDB.asynchCommand() and changed GraphDB.synchCommand() in
order to be able to run non-idempotent SQL commands.
(See
https://groups.google.com/d/msg/orient-database/-VBvFU2TfIw/78z20xCe6S4J)