[3.1.2] Install rspec
[3.1.2] generate static_pages controller
[3.2.1] Add first test

 * generate test
 * modify template
[3.2.1] add test for Help page
[3.2.2] add About page with TDD

 * add spec
 * add routing to routes.rb
  * also remove default comments
 * add action to static page controller
 * add tempalte
[3.3.2] add title test

 * rename layout file
  * to learn erb
 * add testcase for title tag
 * modify matcher from have_content to have_selector
 * add html header to each .erb files
[3.3.3] use provide and yield to set title tag value
[3.3.4] restore layout
[3.3.4] elminate duplication in tempaltes

 * finish chapter 3