coffeescript, jade, stylus, expressを利用する際のGruntfile.coffee

以下の設定で、jade,coffee,stylファイルを更新した際、自動でhtml, js, cssファイルを生成。
さらに何もしなくてもページ更新走ってくれる。（パスは各自設定）
ブラウザのアプリインストールする必要あるけど、livereroadすばらしすぎる
grunt defaultで起動

Gruntfile.coffee

module.exports = (grunt) ->
  
  grunt.initConfig
    coffee:
      app:
        expand: true
        cwd: 'src/'
        src: '**/*.coffee'
        dest: './'
        ext: '.js'

    jade:
      default:
        expand: true
        cwd: 'src/public/partials'
        src: '*.jade'
        dest: 'public/partials'
        ext: '.html'

    stylus:
      default:
        expand: true
        cwd: 'src/'
        src: '**/*.styl'
        dest: './'
        ext: '.css'

    copy:
      main:
        files: [
          src: "src/views/index.jade"
          dest: "views/index.jade"
        ]

    express:
      dev:
        options:
          script: 'bin/www'

    watch:
      options:
        livereload: true
        
      coffee:
        files: '**/*.coffee',
        tasks: ['coffee']

      jade:
        files: 'src/public/partials/*.jade',
        tasks: ['jade']

      stylus:
        files: '**/*.styl',
        tasks: ['stylus']        

      copy:
        files: 'src/views/*.jade'
        tasks: ['copy']

      express:
        files: 'src/*'
        tasks: ['express']
        options: {
          spawn: false
        }
        
    grunt.loadNpmTasks 'grunt-contrib-coffee'
    grunt.loadNpmTasks 'grunt-contrib-jade'
    grunt.loadNpmTasks 'grunt-contrib-stylus'
    grunt.loadNpmTasks 'grunt-contrib-watch'
    grunt.loadNpmTasks 'grunt-contrib-copy'
    grunt.loadNpmTasks 'grunt-express-server'

    grunt.registerTask 'default', ['express', 'watch']