implement devise remove old authentication library
allow users to sign up
clean up devise view markup
refactor specs to work with devise
allow users to connect with Twitter/GitHub
use provider scope on Account
use devise's built in authenticate_user! method
fix failing specs
remove sessions controller
add accounts controller spec
document accounts controller
some changes based on pr feedback
add spec for account_from_oauth
move devise secret key into application.yml
Add Twitter and Devise secrets to configuration.