This commit will require a few changes to the deployment process:
* store AWS credentials in AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY env vars
* store OpenNeo Auth credentials in OPENNEO_AUTH_APP, OPENNEO_AUTH_SERVER, and OPENNEO_AUTH_SECRET env vars
STRIPE_SECRET_KEY and STRIPE_PUBLISHABLE_KEY are now required, too; better have a good .env.
You can always put in dummy values if you have no credentials, though; they only get called up if there's a transaction.
SECRET_TOKEN is now an env var, too, but the production deploy process currently replaces config/initializers/secret_token.rb anyway; this might be the way to go later, though.
