Adding the following method to the documentation (shotgunsoftware#206)

Adds support for Python 3!

Packaging up for the 3.0.40 release

Fixes some issues with certificates when uploading a file.

packaging for v3.0.38

The preferences_read method added, and direct-to-s3 support.

Fixes custom certs issue with uploads/downloads and supports malware …

…scanning return codes.

Preparing release v3.0.35 (shotgunsoftware#161)