onProgress status in 0.4.7

[timothyallan]

Thanks for .spz support, seems to work great! However, as of 0.4.7, at some point while loading, loaderStatus ain't a loaderStatus anymore in the 'onProgress' callback.

The first few times through, it's 0, then at some point, it turns into this:

[mkkellogg]

Yep I see the same thing (looks like it's only happening for SPZ files?) I'll push out a fix soon.