Several minor modifications to funationality:

* supports accessing bucket via S3 '-website' URLs
* supports placing the list.html in a "subdirectory" of a bucket and then only list keys with that path as prefix.
* filtering out of 'index.html' - a hack, to avoid showing index.html which is where I place the list.html.
* removed object sizes - another hack, because I don't want them :)
* default to sorting by last modified descending