switch to a custom list of global keys and use object helper

package.json

@@ -42,7 +42,6 @@
     "esutils": "1.1.6",
     "esvalid": "1.1.0",
     "fs-readdir-recursive": "0.1.0",
-    "jshint": "2.5.11",
     "lodash": "2.4.1",
     "output-file-sync": "^1.1.0",
     "private": "0.1.6",
@@ -57,6 +56,7 @@
     "chai": "1.10.0",
     "istanbul": "0.3.5",
     "jscs": "^1.10.0",
+    "jshint": "2.5.11",
     "jshint-stylish": "1.0.0",
     "matcha": "0.6.0",
     "mocha": "2.1.0",