通过'-m'参数可以在创建rails项目的时候，应用自己的模板
具体如下：

rails new myapp -m https://raw.githubusercontent.com/kamionayuki/my_rails_app_templates/master/composer.rb

需要注意的是，后面的URL需要用raw，也就是说在github中，查看https://github.com/kamionayuki/my_rails_app_templates/master/composer.rb这个文件的时候，点击raw这个按钮，会生成一个页面，上面的命令需要用到这个页面的URL

composer.rb的内容如下：

gsub_file "Gemfile", "https://rubygems.org", "http://ruby.taobao.org"
gsub_file "Gemfile", "# gem 'bcrypt', '~> 3.1.7'", "gem 'bcrypt', '~> 3.1.7'"
# gem 'mysql2'
gem 'bootstrap-sass'
gem 'will_paginate-bootstrap'
gem "rails_best_practices"



after_bundle do
  inject_into_file 'config/application.rb', after: "# -- all .rb files in that directory are automatically loaded.\n" do <<-'RUBY'
    config.i18n.default_locale = "zh-CN"
  RUBY
  end

  inject_into_file 'config/environments/development.rb', after: "# -- all .rb files in that directory are automatically loaded.\n" do <<-'RUBY'
    config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
  RUBY
  end


  #default zh-CN file
  run "wget https://raw.githubusercontent.com/kamionayuki/my_rails_app_templates/master/zh-CN.yml -O config/locales/zh-CN.yml"

  # git :init
  # git add: '.'
  # git commit: "-a -m 'Initial commit'"
end

语法很好懂吧？
run是用系统的命令
还可以用rake db:migrate,generate "scaffold", "Post", "title:string"等指令