Interesting option for spec development

[Chris Holmes]

http://tobie.github.io/specs-on-github/

Source documents still look fairly editable for non-html experts:

https://github.com/tobie/specs-on-github/blob/gh-pages/index.html

Makes use of this 'respec' tool: https://github.com/darobin/respec/

Once we get formatting done it could be interesting to try out both that and sphinx.