refs #98 set ruby version and test tools, bundle install
refs #98 'rails generate controller home'
refs #100 set rspec and guard files for test
refs #98 display the top page
refs #99 delete home_helper
refs #101 add gem 'devise' to Gemfile, and 'bundle install'
refs #101 'rails generate devise:install'
refs #101 'rails generate devise User'
refs #101 'add gem 'haml-rails' and 'html2haml', and 'bundle install'
refs #101 'rails generate devise:views'
refs #101 add db schema file to '.gitignore'
refs #101 modified the setting files
refs #101 add spec of devise
refs #101 add gem 'spork' for test
refs #101 modified spec_helper.rb for devise test helper
refs #101 modified test comments
refs #101 devise sign up and sign in
refs #101 modified routes.rb, but don't sign in and sign up
refs #101 modified spec of controllers
refs #106 internationalization of title