I'm not sure whether there's an advantage to using `aws-sdk` vs. `fog`. Maybe @jyurek or @sikachu know. If fog, I believe this would be:

```
  config.paperclip_defaults = {
    storage: :fog,
    fog_credentials: {
      provider: 'AWS',
      aws_access_key_id: ENV['AWS_ACCESS_KEY_ID'],
      aws_secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
    },
    fog_public: true,
    fog_directory: 'scheddo',
    path: ":rails_env/:class/:attachment/:id/:style/:filename"
   }
```