bump amber-dev to 0.8.2, use require('amber-dev').helpers

Gruntfile.js

@@ -2,7 +2,7 @@
 
 module.exports = function (grunt) {
     var path = require('path'),
-        helpers = require('amber-dev/lib/helpers');
+        helpers = require('amber-dev').helpers;
 
     // These plugins provide necessary tasks.
     grunt.loadNpmTasks('grunt-contrib-clean');

package.json

@@ -25,7 +25,7 @@
     "node": "0.10.x || 0.12.x || >=4.0.0"
   },
   "devDependencies": {
-    "amber-dev": "^0.8.0",
+    "amber-dev": "^0.8.2",
     "grunt": "^0.4.5",
     "grunt-contrib-clean": "^0.6.0",
     "grunt-contrib-requirejs": "^0.4.4",