fix(bower): use sass-boostrap instead of bootstrap-sass

The Former is the one use by yeoman project
refactor(style): change screenshot to a SASS partial

Read http://sass-lang.com/guide#4
chore(clean): remove unused CSS file
refactor(HTML): use class to mark page

Instead of `#screenshots` we use a `.screenshots` on the <body> element.
Also use a `.screenshot` to mark template anchor
chore(clean): remove logging
fix(style): udpate to bootstrap 3.x: .hero-unit→.jumbotron
fix(bootstrap): restore tabbing style/behavior

Migrating to Bootstrap 3 break numerous styles/behavior
style(indent): fix indentation
style(js-): move jquery and modernizer in same build block
refactor(html-): remove call to screenshosts.css (partial)

This file is now a partial include in main.scss
fix(tpl): update template anchor to previos refactor