Changed the way squashing alorithm
Changed the way squashing alorithm

1. Now we make sure we delete all paths that begin with the marker file
   path.
2. We add the marker files back when no files were found to match the path.

This can create some additional marker files that are added back to the
image, but at least we make sure the images that will be run do not have
the files available.

This will be handled better in near future.

lichia/docker-scripts,goldmann/docker-squash,jpopelka/docker-scripts,goldmann/docker-scripts,TomasTomecek/docker-scripts