gulp.order

概念：
The gulp plugin gulp-order allows you to reorder a stream of files using the same syntax as of gulp.src，這是官方定義，簡單來說，就是按給定的順序整理需要處理的文件集。
用法：

var order = require("gulp-order");
var coffee = require("gulp-coffee");
var concat = require("gulp-concat");

gulp
  .src("**/*.coffee")
  .pipe(coffee())
  .pipe(gulp.src("**/*.js")) // gulp.src passes through input
  .pipe(order([
    "vendor/js1.js",
    "vendor/**/*.js",
    "app/coffee1.js",
    "app/**/*.js"
  ]))
  .pipe(concat("all.js"))
  .pipe(gulp.dest("dist"));

  // When passing gulp.src stream directly to order, don't include path source/scripts in the order paths.
  // They should be relative to the /**/*.js.
  gulp
  .src("source/scripts/**/*.js")
  .pipe(order([
    "vendor/js1.js",
    "vendor/**/*.js",
    "app/coffee1.js",
    "app/**/*.js"
  ]))
  .pipe(concat("all.js"))
  .pipe(gulp.dest("dist"));

參數：
可以給定參數，用法：

gulp.pipe(order([...], options));

option的參數：
1. base：
Some plugins might provide a wrong base on the Vinyl file objects. base allows you to set a base directory (for example: your application root directory) for all files.

Tips：
1. Try to move your ordering out of your gulp.src(…) calls into order(…) instead.
2. You can see the order of the outputted files with gulp-print