Root to new session view.
Add favicon.
Add devise views to customize; refactor display_session_control_links view helper.
Add separate layout for sessions controller and style that layout.
Adjust styling for session view.
Further style login page, add sticky footer.
Style login page.
Add CanCan.
Add CanCan ability.rb.
Fix routes to direct first to new session view and then to home#index once signed in.