fix(jar): Add directory entries to the jar file
According to the [jar file specification](http://docs.oracle.com/javase/7/docs/technotes/guides/jar/jar.html) > For resource files with non-empty directory prefixes, mappings are also > recorded at the directory level. Only for classes with null package > name, and resource files which reside in the root directory, will the > mapping be recorded at the individual file level. If needed, directory entries may be excluded using `:jar-exclusions` regex like `#"^.*/$"`.
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