Add a --clean-up option to the `cook` command to clean up the kitchen automatically on the server after a cook
Extract code to clean up after cook into it's own method
Make clean_up option available to the bootstrap command
Merge pull request #345 from cgunther/cook-clean-up

Add a --clean-up option to the `cook` command to clean up the kitchen automatically on the server after a cook

Fixes #292 and #267