Lets document these utility methods. Gaia uses gjslint, which in turn enforces [JSDoc](http://usejsdoc.org/)-style comments. You can learn about JSDoc from their website, but I've found it easier to reference existing code in Gaia ([Corey's Emitter code](https://github.com/mozilla-b2g/gaia/blob/8b478f6ed565075e3c0e1f5400743ba4e75950bc/apps/clock/js/emitter.js) for example) and lean on the linter to tell me when I've made a mistake.