added jQuery-ui and prepare CDN usage
more work on CDN
updated bootswatch.com to 3.3.0 and using a CDN
force copying application.js
bugfix in head.html.erb template
bugfix: add options hash to bootswatch_link_tag again
load font-awesome from CDN only if in production
remove turbolinks from CDN loaded font-awesome and bootswatch
add font-awesome link to bootswatch_link_tag
use logged_in? instead of current_user.present?