Use of numpy style or google style docstrings

[glenfant]

Google style or numpy style docstrings are easier to read in the source code than the "old" Sphinx style. In addition, these "new" docstring styles are supported OTB by the latest Sphinx.

http://sphinx-doc.org/ext/napoleon.html
http://sphinx-doc.org/ext/example_google.html

[amontalenti]

@glenfant Thanks for the suggestion. This was also suggested in PR #4, where this is some discussion of it. I plan on evaluating Google style in the next couple days and once I do, I'll likely update the recommendation.

[amontalenti]

Closing in favor of PR #4.