Squashed 'subtest/' changes from e96bf18..0858c9a

0858c9a More notes
c346496 Some notes!

git-subtree-dir: subtest
git-subtree-split: 0858c9a068649dc5c691c88e9e484ba6b0da7b19
Merge commit '372d8fb2b6b45db22029751772fe79c3a7160502'

Conflicts:
	subtest/README.md