Add support for AWS region.

[razorsedge]

• Add support for specifying the AWS region ("-r).
• Fix the location of the bytefmt library.

[misterbisson]

👍 to this one. I was just looking into how to add support for regions.

[pavelanni]

Exactly what I tried to do before I saw your pull request! I'm still a beginner in Go, so I'll go with your code changes. Thanks!

[razorsedge]

I don't know much about Go myself. It just seemed easy enough to add another CLI parameter and the AWS SDK had an example on how to pass on the region.

So, "It works for me. I hope it does for you." :-)