Fix bugs with .dockerignore and improve integration test #424
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I improved handling of the .dockerignore file by:
helper functions to determine if a file should be deleted
if the Dockerfile is specified in .dockerignore it won't be deleted, and
if it is specified in the .dockerignore it won't end up in the final
image
files to ignore, and updated the .dockerignore to include exclusions (!)
Should fix #422