Merge pull request #45 from szilardhuber/master

VirtDB interface mimialised + logging to diag service
Merge pull request #46 from szilardhuber/master

Changed ellapsed microsec precision from millisec to nanosec.
Update README.md
Moved node-connector to virtdb-common.
Merge branch 'master' of github.com:szilardhuber/virtdb-apps