Switch to Google Python Docstrings

[gamingrobot]

I am not a huge fan of sphinx docstrings and readthedocs supports Google Python style docstrings

Example here

Sphinx Extension for converting docstrings https://sphinxcontrib-napoleon.readthedocs.org

Thoughts?

[Gjum]

Looks like something I've been wanting for a long time.

[txomon]

I would avoid such a verbose documentation, we are still in pre v1, things and APIs are changing still. High level documentation would be more appropriate IMO. I would leave functions for later =)

[gamingrobot]

All done, see #165