TF:U3,L2,A4 - create categories_controller.rb as well as index and show views for categories
U3,L2,A5 - modify WelcomeController and views/welcome/index.html.erb
U3,L3,A1 - installed gem twitter-bootstrap-rails, less-rails, and the rubyracer
TF:U3,L3,A3 - base application layout using Bootstrap