add hash->inverted()

Hash could still use work...
  - POD is fairly disorganized.
  - lossless invert(ed) seems to call for a lossy reverse(d)

	modified:   lib/List/Objects/WithUtils/Role/Hash.pm
	new file:   t/02_hash/inverted.t
Merge branch 'hash-invert'

* hash-invert:
  add hash->inverted()