Merge remote-tracking branch 'origin/i18n'
Update README.md
Re-organize config.rb
Cleanup Gemfile
Move images, css and js to assets directory
Delete unused images
Enable localization
Remove uneeded extensions from partial filenames
Add bootstrap-sass gem
Port index page to Bootstrap
Implement sidebar
Implement helpers to construct sidebar links
Labels foe deprecated Docs
Port default layout to Bootstrap
Add syntax highlight theme
Change background color of sidebar sub-menus
Add helper to detect active parent menu
Add helper to detect active child menu
Extract navigation helpers from config.rb
Port example code blocks to Bootstrap