Added a python3 variant, and removed python-cryptography, and pyjwt from
the dependencies.  They are required only to run one test, that is not
even being installed.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>

This version adds compatibility with OAuthlib 3.0.0 and above.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>

Updated Makefile to use PyPackage, added option to build source package,
updated PKG_SOURCE_URL, and adpated to python-pyjwt new package name.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>

OAuthlib authentication support for Requests.
This package is a direct dependency of seafile-seahub.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>