Use Capybara.default_host
Use Capybara API
Use Capybara API
Use bitclust-core gem and bitclust-dev gem
Add ensure_rubydoc to get rubydoc source surely
Create bitclust database with cloned rubydoc source tree
Do not generate bitclust database if rubydoc is not updated
Use Capybara API
Fix test case for latest data
Ignore bitclust data
Ignore files generated by bundler
Use Capybara API

Pass all test cases.