add jazz_hands
Built a FilesystemSandbox that can mount new disk images and populate with
random data.
- build a diskimage everytime; using a template image causes duplicate UUIDs.
- PhysicalStorageVolume should be able to detect drives thru UUID
- StorageVolume can find the availability of a drive thru UUID

Next:
- Get the spec passing.
- When running acceptance tests within a ReadOnly vagrant instance, the logs should go into a /tmp directory.
- The console outputs for `dd` and `mkfs.ext4` should be disabled.
- Add a Logger to all CLI/model operations.