==================
Bugfixes
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- The client was raising unspecified ClienException when response has 2xx success
status code other than 200 or 202. Now client's `API.request` method just returns
a tuple of `requests.Response` and `None` when response status code neither of
200, 202, 403 or 500. (7)
- Fixed can't delete file from the server after calling upload_file two and more times with the same file object (8)
Improved Documentation
----------------------
- Document RemoteFileSystem class methods (4)
- Fix sphinx cross-reference links (5)
- Remove repetition of `optional` word (6)