jshintrc: set "es5" mode to true

So that I can use reserved words as property names...

Author: TooTallNate

.jshintrc

@@ -1,6 +1,7 @@
 {
   "asi": true,
   "laxcomma": true,
+  "es5": true,
   "node": true,
   "strict": false
 }