Cleanup
Disable stop button when not timing.
Add Devise for Rails user model
Add generated Devise views
Add basic User model to Ember app
Add email to UserSerializer
Divide application.html.erb into header, yield outlet and footer.
Add container-fluid outer container for Devise forms.
Add Rails UsersController
Set up Devise to respond to json
Add CurrentUserController and Ember Initializer to check header for user data
Add support for basic user actions: login, logout, sign up