use of OrientGraphTx
update to orient 1.7.5 and use of transactions
Merge pull request #40 from baasbox/master

update from origin
Merge pull request #45 from baasbox/master

update from origin master
implemented transactions and related tests
first merge with master
moved issue_412 serialization patch from the service to the controller
Merge pull request #448 from giastfader/master

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