Serve bower_components outside app root with grunt-contrib-connect

connect-bower.js

connect: {
  app: {
    options: {
      port       : 9000,
      base       : '<%= appRoot %>/',
      open       : true,
      livereload : true,
      hostname   : '127.0.0.1'
      middleware : function(connect) {
        return [
          connect().use(
            '/bower_components',
            connect.static('./bower_components')
          ),
          connect.static('./app')
        ];
      }
    }
  }
}