bb3.0.0

1. Updates dependencies (fixes bmsherman#7 and incorporates the commit at https://github.com/bmsherman/haskell-matlab/tree/updated_bounds)
2. Adds stack instructions
3. Updates LTS/ghc use
4. Adds instructions and scripts for using with NixOS (also using stack)
5. Begin to flesh out tests, though this is ongoing.
6. Remove tabs (certain modern ghc checks don't like this) and trailing whitespaces
7. Use CBool present in FFI libs (although other than building I haven't tested this).
8. Adding some minor convenience functions to Engine API