Change over archive storage key

This changes the format of `archive` from `{collectionid}/{year}/{month}/{day}` to `{year}/{month}/{day}/{collectionid}`.

This will allow us to take all the edits of a particular day or month more easily. Where as before it was hard to do this, although the advantage was you could get all history of edits to a particular collection since it was created.

@stephanfowler