Fixing failing tests
PEP8 Fixes iii

Change-Id: I5a094509be96e2fafc070ec0d5bcb5df0d6a524a
Renaming 'instance' param.
Checking for NotFound models so that the returned error is friendly
Merge branch 'master' of https://github.com/SlickNik/reddwarf
First cut of invoking backup

Change-Id: Ibd74a9f9c1f452ce736cfe90d2ed217b8e34c07a