code: function touch(argv, callback) {
    util.patch(argv[2], 'DELETE {} .', function(err, val) {
      if (!err) {
        console.log('touch to : ' + argv[2]);
      }
    });
  }
docs: touch gets list of files for a given container
  
  @param {String} argv[2] url
  @param {String} argv[3] data
  @callback {bin~cb} callback