Uploading files with file objects

[hjpotter92]

I am using the awesome package from a self contained AWS Lambda setup. However, since uploads feature currently required absolute path to a file (which is not possible in a Lambda environment); it'd be helpful if we could use a file object/stream as well to be uploaded.

[maxtepkeev]

Makes total sense, thanks for raising this issue.

[maxtepkeev]

Tests, docs and a bit of code changes are in 3eb0523. This will be part of next release.