(lesson 5) extract title to a helper
(lesson 5) add bootstrap-sass to the Gemfile
Update Gemfile.lock
(lesson 5) import bootstrap's styles
(lesson 5) modify layout
(lesson 5) modify home page
(lesson 5) add custom CSS
(lesson 5) move header to a partial
(lesson 5) add footer
(lesson 5) leverage SCSS rules
Remove unused contact link
Modify full_title helper
(lesson 5) use named routes
Generate users controller
(lesson 5) add a signup page