speed up capybara, poltergeist & sprockets

capybara.rb

# spec/support/capybara.rb

require 'capybara/poltergeist'

Capybara.javascript_driver = :poltergeist
Capybara.default_wait_time = 5

Capybara.server_port = 3001
Capybara.app_host = "http://localhost:3001"

ActionController::Base.asset_host = Capybara.app_host

test.rb

#config/environments/test.rb

config.assets.enabled = true

config.assets.debug = true