upgrade to Awestruct 0.5.4.rc

- upgrade Awestruct to 0.5.4.rc
- upgrade Asciidoctor to 0.1.4
- upgrade Yard to 0.8.7.1
- require 'bootstrap-sass'
- alias preview and serve Rake tasks to dev task
minor fixes to auto deploy guide
update coffee-script-source version
update page titles
fix Asciidoctor config, update site title & desc
use site title and desc in layout, add desc meta

- also remove AsciiDoc hack
enable header, add authors, fix syntax
fix page title
honor nowrap, fix admonition labels