I'd make the ```pushServerURL``` a bit more concrete in this example (like ```http(s)://SERVER:PORT/CONTEXT```).

Simply because this is backing the Android/iOS version, while those familiar w/ AeroGear.js might try an URL like "http(s)://SERVER:PORT/CONTEXT/rest/registry/device" (see https://github.com/aerogear/aerogear-js/blob/master/src/unifiedpush/aerogear.unifiedpush.js#L30)

 a bit more con