Update program version in command-line help
Refactor YAML and command-line option processing
Add comments to delineate option processing - main
Remove unnecessary whitespace in upload.rb
Rename the S3File class to Image

Image does NOT inherit from File.
Add upload_to to the Image class and rename 'file'

Add upload_to to the Image class and rename 'file' to 'image' in
upload.rb.
Fix syntax error by changing 'object' to '@object'
Add the Image::head method

I don't think that this method really belongs in the Image class, but
for the time being it will do to expose information that I want to use
in upload.rb.
Add the ability to upload multiple files at once

Add the ability to recursively upload all of the image files in a
specified directory.
Bump version number