Miarec-s3fs

Changed

- Restore the old behavior of isdir() method

Changed

- Do not check a presense of parent directory when opening files in non-strict mode
As directories in S3 are a virtual concept, they may not exist as individual objects.

Changed

- Improve scandir() behavior when strict mode is disabled.
No need to create empty object for directories.

- Forked from [fs-s3fs](https://github.com/PyFilesystem/s3fs) version 1.1.1 (released on 2019-08-14)
- Rename package to `miarec_sftp` and re-organize files

The latest release of the original (forked) [fs-s3fs](https://github.com/PyFilesystem/s3fs) repo