def full_filename(for_file)
      extname = File.extname(for_file)
      [for_file.chomp(extname), version_name].compact.join('_') << extname
    end
def full_filename(for_file)
      extname = File.extname(for_file)
      [for_file.chomp(extname), version_name].compact.join('_') << extname
    end
Put the version name at the end of the filename since the guid is also stored
 e.g. guid/filename_thumb.jpg instead of CarrierWave's default: thumb_guid/filename.jpg