update fancybox2-rails, add jquery.turbolinks

without jquery.turbolinks the newest version of fancybox2 would not work
update paperclip

use master: https://github.com/thoughtbot/paperclip/issues/1457
update to capistrano 3
update gems, cleanup code

had to fix sprokets for now:
https://github.com/rails/sass-rails/issues/191