Tweaks for JS happiness

These are all minor changes to help make the `toml-test` suite more JavaScript-friendly. It switches all of the floats from `X.0` to `X.1` will prevent JavaScript from converting floats into integers (okay not really, to JS they are all `Number`s but for the purpose of trying to tell the difference for the decoder...), and then a small tweak to the number used for the long integer test since JavaScript is not capable of producing the number currently being used.