Do not create directories if autocreation is enabled on the server

Hello :)

I started using your library in our company project.

I noticed that it tries to explicitly create all directories every time. However, in our `nginx.conf`, we have this directive for the WebDAV share: `create_full_put_path on;`. So there's actually no need to create any directories prior to issuing the PUT request.

I hope that this change helps lighten server load a bit.

Thank you.