make the listFiles method return files in sub-directories. This is to facilitate usage like it was S3.
updated version, so we can distribute 0.1.3
updated to use Stream.empty()
provide some additional documentation around the listFiles method on the FileSystem
another clarifying comment
Merge pull request #10 from flightstats/local_filesystem_recursive_filelist

make the listFiles method return files in sub-directories.