Convert relative paths to absolute paths.
Remove Path function - it isn't imported so it's a bit useless.
Put NONE into List::NONE so it is scoped and easier to use, e.g. Paths::NONE.
Convenient methods to inspect file state.
Update to use rspec.
Reorganised path and list functionality, added Path#shortest_path.

Avoided using File.split as it isn't always systematic.
Add test for inner paths.
Handle both Path and String instances.
Add basic filesystem predicates.
Add mtime to filesystem module.
Make sure the root path is a string as expected.
Bump version.