Ran 'rails generate devise:install', 'rails generate devise User', 'rails generate devise:views', then ran dbmigrate.
Set up an intermediary page to handle authentication on the rails end.
Set up send grid for use in production: 'heroku addons:add sendgrid:starter'. Keys are stored on heroku. See them with: 'heroku config'
Setup omniauth-facebook for use with devise.