Stop Sass::Plugin from double compiling stuff

sass.rb

if Rails.configuration.try(:sass)
  Rails.application.config.middleware.delete(Sass::Plugin::Rack)
  Rails.configuration.sass.tap do |config|
    config.load_paths << "#{Gem.loaded_specs['compass'].full_gem_path}/frameworks/compass/stylesheets"
    config.preferred_syntax = :sass
  end
end