Fix use of ES6 features not available in Node 4

Object destructuring and use of let/const without 'use strict' is not supported in node 4. Tests did not fail because of probably forgotten removal of babel in mocha.opts

Author: simonihmig

package.json

@@ -40,8 +40,6 @@
     "source-map-support": "^0.4.0"
   },
   "devDependencies": {
-    "babel-core": "^6.10.4",
-    "babel-preset-es2015": "^6.9.0",
     "chai": "^3.5.0",
     "chai-as-promised": "^5.2.0",
     "fs-promise": "^0.5.0",

src/fastboot-headers.js

@@ -1,3 +1,5 @@
+'use strict';
+
 // Partially implements Headers from the Fetch API
 // https://developer.mozilla.org/en-US/docs/Web/API/Headers
 function FastBootHeaders(headers) {

src/fastboot-info.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var RSVP = require('rsvp');
 var FastBootRequest = require('./fastboot-request');
 var FastBootResponse = require('./fastboot-response');
@@ -16,7 +18,8 @@ var FastBootResponse = require('./fastboot-response');
 function FastBootInfo(request, response, options) {
 
   this.deferredPromise = RSVP.resolve();
-  let { hostWhitelist, metadata } = options;
+  let hostWhitelist = options.hostWhitelist;
+  let metadata = options.metadata;
   if (request) {
     this.request = new FastBootRequest(request, hostWhitelist);
   }

test/mocha.opts

@@ -1,3 +1,2 @@
 --require test/support/common
---compilers js:babel-core/register
 --timeout 10000