Tweak use of paths
Refactor use of git with bashmenot
Update README
Simplify use of paths
Improve notation
Update use of Halcyon internal vars
Banish aligned line continuations
Add KEEP_ENV to speed up runtime restore
Update use of internal Halcyon vars
Rename KEEP_ENV to KEEP_ALL
Try another implementation of KEEP_ALL
Tweak secret config var pattern
Tweak notation
Allow specifying BUILDPACK_SSH_PRIVATE_KEY
Simplify keeping all layers
Improve naming
Tweak error handling
Improve runtime behaviour
Tweak secret config var pattern
Use HTTPS where available