Integrate with Aurora.js framework

[Aurora.js](https://github.com/audiocogs/aurora.js) is a framework that enables decoding FLAC, AAC and MP3 files in the browser using Javascript, no Flash player or other plugin required!

Features:
- Volume control bar
- Load percentage

Problems:
Aurora.js requires the entire "chunk" to be loaded then it could start playing, but ownCloud doesn't support HTTP chunked request (`Range` header) for now.
When firing XMLHttpRequest, Aurora __does__ pass the `Range` header, but ownCloud will simply ignore it and returns the entire file.