* Remove previous file in spec
* Add new method S3Utils::Path#join_with_basename
* Refactor for using #join_basename
* Add new method #join_with_dir
* Add new method #dir_glob
* Fix path name
* Refactor for using S3Utils::Path#dir_glob
* Add new case that path includes ".."
* Refactor S3Utils::Path#join_with_dir