Squashed 'propane_distribution/' changes from f276bb9..33cf533
Squashed 'propane_distribution/' changes from f276bb9..33cf533

33cf533 Initial support for PEP440-compliant version numbers.
27f5105 Fix regex.
ac917f4 Update propane_distribution to handle semantic versions more readily.

git-subtree-dir: propane_distribution
git-subtree-split: 33cf5338c94225f52945d9a0b558790c9fa22ad5

tylerbutler/engineer,tylerbutler/engineer,tylerbutler/engineer