JSONP support

It would be really nice if the API supported JSONP callbacks, f.ex http://min.us/api/GetItems/mvph5BW?callback=fn would result in:

```
fn({
    "READ_ONLY_URL_FOR_GALLERY": "vph5BW",
    "GALLERY_TITLE": "Minus for WP7 Screens",
    "ITEMS_GALLERY": ["http://i.min.us/jlZEMU.PNG", "http://i.min.us/jlVqay.PNG"]
});
```

Most API's supports this already (Picasa, Flickr etc).

best,
David
