Fix directory detection.
Add missing __babashka_log method.
Print a usage message given wrong number of args.
Follow symlinks when working out origin binary.
Add methods for checking files for freshness.
Fix call to missing fail command.
Fix call to missing __babashka_log_raw.
Add more structure to the README.
Add a fail method for useful errors.
Merge pull request #1 from larsyencken/master

Make things work