Create users
Login page
Create Session model; update new session template
Use pry
Create sessions
Destroy session
Make User.find_by_name case-insensitive; tweak Session model
Use strong params for sessions
App Controller current_user & logged_in? helpers
Rewrite SessionsController specs for strong params
Highlight form fields with errors
Add log out link to topbar; quick fix for logged_in?
Hide administration links for regular users
Restrict posting actions