Module imports not working properly in refactored code

[alichtman]

I had an import statement in one of the files that was pulling from a locally installed version of shallow-backup, so all of this code worked on my laptop, but would crash unless you happen to have a shallow-backup binary installed.

In looking at it now, I don't really understand why this doesn't work. I'll look into this more soon...

Also, our testing suite needs to include more shallow-backup functionality, not just utility testing. The suite shouldn't pass this build.