Fix guide building when Rails logging is included

guide/lib/helpers.rb

@@ -1,10 +1,13 @@
 require 'pry'
+require 'rails'
 require 'action_view'
 require 'active_model'
 require 'active_support/core_ext/string'
 require 'htmlbeautifier'
 require 'slim/erb_converter'
 
+Rails.logger = Logger.new($stdout)
+
 Dir.glob(File.join('./lib', '**', '*.rb')).sort.each { |f| require f }
 
 $LOAD_PATH.unshift(File.expand_path("../../lib", "lib"))