Compatibility with webdav.Filesystem interface

[nicolaspernoud]

Hello,

Thanks for your work.

What would have been even greater is to keep the compatibility with the existing File/Filesystem interfaces to provide an abstraction layer that can be used with existing libraries (webdav.FileSystem and webdav.File for example).

An other point : using minio-go instead of aws sdk would enable use of s3 compatible services.

Best regards.