Rank Your Music game, using Spotify API

* Rank music according to Spotify's popularity index
* Temporarily authenticate using [Implicit Grant Flow](https://developer.spotify.com/web-api/authorization-guide/#implicit_grant_flow)
* Pulls a random playlist from your account (must have >1 song)
* Rearrange tracks using [Waffler](https://github.com/zenahirsch/jquery-waffler) jQuery plugin
* Check answers, red indicates the current track is less popular than the track directly below
* Preview song by clicking music icon in upper right-hand corner of each track
Generally you want to let the callback know if it was a success or not... a couple of options are:

* Passing an `error` string/object to the `callback` if there was a problem – this is the convention in Node.js
* Using [Promises](http://api.jquery.com/deferred.then/) – sorry we didn't get to cover this, but you can check out [the examples](https://github.com/advanced-js/deck/tree/gh-pages/demos/ajax/promises)