Make sure lvmsync has a compatible version of git-version-bump [Fixes GH#35]
Quiet tests right the hell down

I want to see the tests passed, not that an LV was created.
Add a test for snapback file creation and application
Accurately report when the lvmsync receiver fails

This work was most cleanly achieved by refactoring out a lot of "behind the
scenes" logic that should be buried inside a "LogicalVolume" class, so I
made one, and used that.  Overall, I think it's a definite net win.
Be more verbose

Pass -v to the receiving lvmsync, and immediately print any output
from the receiver, too.