Integrate changes from AshotS / python-seafile-api and fbuchmeier-abi / python-seafile-api into haiwen / python-seafile

[fbuchmeier-abi]

Hi AshotS,

would you mind if I created a PR to integrate your changes
https://github.com/AshotS/python-seafile-api/commits/master

and my changes
master...fbuchmeier-abi:master

into the upstream project?
https://github.com/haiwen/python-seafile

Thanks and regards,
Florian.