Fix handling of packages with unexpected files. #114
Merged
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Some file browsers helpfully create extra hidden files in any
directory they view. It may have been better to just ignore anything
without a module.json, but #106
made module.json optional, so technically any directory is a valid
module now and we need a new schema revision to change that behavior.
We could alternatively add an explicit module list to prefab.json, but
that would also require a new schema revision.
For now, just ignore all files (fixes the .DS_Store case) and any
hidden directories (just in case).