Scala UBJSON library

I know https://github.com/ubjson/universal-binary-json/issues/93 was never closed, and doesn't seem to have been added to the website. But I've just added [UBJSON support](https://kag0.github.io/ninny-json/ubjson/) to the [ninny json library](https://kag0.github.io/ninny-json/USERGUIDE) if you'd like to add that to the website.