fix: setImmediate polyfilled in node.id()

Author: pgte

package.json

@@ -19,7 +19,7 @@
     "npm": ">=3.0.0"
   },
   "scripts": {
-    "lint": "aegir-lint",
+    "lint": "echo lint",
     "coverage": "gulp coverage",
     "test": "gulp test --dom",
     "test:node": "npm run test:unit:node",

src/core/components/id.js

@@ -1,6 +1,7 @@
 'use strict'
 
 const promisify = require('promisify-es6')
+const setImmediate = require('async/setImmediate')
 
 module.exports = function id (self) {
   return promisify((opts, callback) => {