title: How do I rename a file with Fog?
body: <p>I have a rails 3.2 app. Using fog to store files in S3.</p>
  
  <p>I would like to write a script to rename all of the files that have been uploaded. I can't seem to find any fog documentation in this area.</p>
  
  <p>Is this possible with fog? Do I need another gem?</p>