Carrierwave

All of the uploady goodness of Carrierwave including tests to see if the images are present on the meme show and index pages.
You can wrap this s3 and fog setup stuff in an if statement so that it's only set up in production, and set the store to :file in here ratehr than in each uploader.

```ruby
if Rails.env.production?
  config.fog_credentials = {
    # blah blah
  }

  config.storage = :fog
else
  config.storage = :file
end
```