* Changed: s3cp now adds source file basename to destination path if destination
           path ends with '/'.

           e.g.  s3cp s3://bucket/path/to/file.ext s3://bucket/some/other/path/
                 will copy the file to s3://bucket/some/other/path/file.ext
* Changed: Speed-up s3ls -l (long-listing format with date + size). Performance
           has regressed since migrating to AWS SDK (from right-aws) since
           high-level AWS SDK API doesn't support memoization of S3 objects --
           back to using low-level API.
Version 1.1.14