* s3: list_objects -> list_objects_api
* s3: use path_info for _list_paths
* s3: separate _list_paths from _list_objects
* s3: support max items for listing objects/paths
* s3: take into account directories on `exists`
* s3: overwrite `isdir` method
* s3: custom collect directory entry for s3
* s3: strip checksum when collecting directories
* remote: change walk implementation to walk_files
* s3: add comment about isdir logic
* s3: use `dir_path` correctly on `isdir`
* tests: add a few unit tests for S3
* s3: use path_info join instead of posixpath
* tests: use parametrize for s3 tests
* remote: use posixpath accordingly
* tests: remove undeeded AWS variables from S3 test
* tests: rearrange parametrize values for readability
* tests: add encoding, use a single s3 instance, for loop instead of parameterize
* py2: fix encoding
Veselin Borisov
Saugat Pachhai
Ruslan Kuprieiev
Mr. Outis