Add MIT licence file
(2) Create index action for home controller
(3) Add Devise gem
(4) Create access-controlled Note model
(5) Add authentication to all controllers
(6) Add belongs_to relationship to User
Seeds
Add links to home page
Tidy up notes UI
Add debugger gem
Set user on Note in controller
(7) Add user_impersonate2 gem
(8) Add impersonation header and link
(9) Add staff concept to User model