Clean before adding chippery as subtree
Squashed 'chippery/' content from commit 4e375de

git-subtree-dir: chippery
git-subtree-split: 4e375de663e0eaeeeff1c94d7870f3e72122424e
Merge commit 'ce9458b86bd03ee6c5823d3e375dfcdf68897915' as 'chippery'
Change chippery from subtree to symlink for development.