craftyjs/Crafty — pull request #600 by mucaho (2013-11-02 18:59:02+00:00)
Title: Return value when setting crafty.asset(key, value)

To make things easier
e.g.

```javascript
var prefixMusic = "/music/";
var musicAssets = [
Crafty.asset("music1.mp3", prefixMusic + "music1.mp3"),
Crafty.asset("music1.ogg", prefixMusic + "music1.ogg")
];
Crafty.audio.add("music1", musicAssets);
```

remake of #595