finish the first version of patch_file

bin/rails

@@ -0,0 +1,18 @@
+#!/usr/bin/env ruby
+# This command will automatically be run when you run "rails" with Rails 4 gems installed from the root of your application.
+
+ENGINE_ROOT = File.expand_path('../..', __FILE__)
+ENGINE_PATH = File.expand_path('../../lib/patchfile/engine', __FILE__)
+
+# Set up gems listed in the Gemfile.
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
+require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
+
+# require 'rails/all'
+# require 'rails/engine/commands'
+require "action_controller/railtie"
+require "action_mailer/railtie"
+require "sprockets/railtie"
+require "rails/test_unit/railtie"
+require 'rails/engine/commands'
+require "mongoid/railtie"