Added the missing native functions in Native.Basics

Proposed bugfix for https://github.com/elm-lang/Elm/issues/769.

To be honest, I'm not sure how basic functions worked before this. It seems really weird that references like [this](https://github.com/elm-lang/Elm/blob/3726aa642827a4c35d4e1f6aa2c5052c5e485b97/libraries/Basics.elm#L201) worked since its native function was never defined.