(PE-3266) Add `mkdirs!` function and tests
Fix typo in `hierarchy`
(PE-3673) Standardize on raynes.fs
(PE-3673) Move tempfile fns to core
Merge pull request #41 from cprice404/maint/master/PE-3266-add-mkdirs-and-tests

(PE-3266) Add `mkdirs!` function and tests
(PE-3673) Add tests for temp-file and temp-dir
Merge pull request #42 from cprice404/maint/master/PE-3673-standardize-on-raynes-fs

(PE-3673) Standardize on raynes.fs