Autogenerate sphinx autodoc docs on Master

[innovate-invent]

Feature request

Numba needs better code documentation and I feel a good way to motivate contributions is to maintain current Sphinx docs that are accessible via the website.
Travis-CI supports autogeneration of the docs: https://github.com/Syntaf/travis-sphinx

[seibert]

These docs are (usually) automatically updated whenever there is a merge to master:

http://numba.pydata.org/numba-doc/dev/index.html

It's done with a crude cronjob, so I am interested in moving that to Travis-CI at some point.

[innovate-invent]

Ah sorry, I meant something along the lines of autodoc generated content.

[innovate-invent]

Edit: There are a number of options for the docstring format. I am used to restructuredtext but it seems Google has produced a cleaner format. Sphinx was given support for it via http://sphinxcontrib-napoleon.readthedocs.io/en/latest/index.html

It also provides a format produced by NumPy, it might be worth considering given Numbas close relationship to the project.

[innovate-invent]

#2977 Was created to establish the convention.