You will need to create a .env file in the Cupid directory. You should have the following variables defined.
SECRET_TOKEN=*SOME HEX STRING*
DEVISE_SECRET_KEY=*A DIFFERENT HEX STRING*
SMTP_DEV_EMAIL=a@example.com # Only necessary for development - where all emails will be delivered
SMTP_ADDRESS=smtp.mandrillapp.com
SMTP_DOMAIN=gmail.com
SMTP_USERNAME=cyrus.stoller@gmail.com
SMTP_PASSWORD=*any valid mandrill api key*- Mandrill API: http://mandrill.com/