位于分支 officesimon
 要提交的变更：
	新文件:       app/assets/javascripts/welcome.js.coffee
	新文件:       app/assets/stylesheets/welcome.css.scss
	新文件:       app/controllers/welcome_controller.rb
	新文件:       app/helpers/welcome_helper.rb
	新文件:       app/views/welcome/index.html.erb
	修改:         config/routes.rb
	新文件:       test/controllers/welcome_controller_test.rb
	新文件:       test/helpers/welcome_helper_test.rb