FORK: newrhelic -> newrelic-nfsiostat

This represents that massive rebranding / forking / splitting effort from
https://github.com/jduncan-rva/newRHELic to
https://github.com/DeliveryAgent/newrelic-nfsiostat

The changes are too numerous to list, but mostly its pulling out all the
other statistic stuff and making the NFS stuff front and center.

I also added the ability to track "duration" since last run (which I
will port back to newrhelic)

~tommy
more branding changes
Changed version to 0.2.0
Merge pull request #2 from TJM/rebranding

Rebranding