When a user doesn't have a Gravatar, we show the default Codebrawl avatar, like on this profile page: http://codebrawl.com/users/jorrizza.
On staging, there's a broken image: http://staging.codebrawl.com/users/jorrizza
I'm putting this up here so I don't forget, and will claim it when I start working on it. Until then, feel free to snatch it. ;)
Fix the default avatar on staging. Closes #27