[Request] - Sub Folders

[curtgadget]

Thanks for the software. It's great. I do have one small request.

We will be using the S3 storage option primarily and we like to keep our buckets tidy by using sub folders.
It would be awesome if in the attributes array passed in during saveFromFile, we could specify a subfolder.
This could work the same for subfolders in local storage theoretically.

Thanks
-Ian