[WIP] Mac osx bindings

[sebradloff]

Fixes issue #368

Need help figuring out the travis CI bit for mac osx build. I think I have something here to get it working. I was able to run it on my mac but difficult for me to be sure that I properly "tore down" my environment and rebuilt.

Notes I had. After using virtualenv to install all requirements and run the setup.py

pip install https://github.com/pyinstaller/pyinstaller/archive/develop.zip # i don't know why pyinstaller==3.5 doesn't work but it does not
https://stackoverflow.com/questions/48876156/pyinstaller-fails-to-import-site-module-in-python3-on-macosx
pip3 uninstall enum34
bash scripts/pyinstaller.sh