adding a test for makeDirectory() in a reroot FS

I'm not 100% sure this is how it's meant to work, but couldn't find a
test so I thought I would start with this.

This currently fails.
1.7.1
Fixes #34

...but is a hack
Merge pull request #34
Merge pull request #32
Fix rerooted makeDirectory
Patch up JSON content ok call
1.7.2