* Add YARD and plugins to generate source code doc
* Expose yard Ruby doc in gitdocs
* Add yard doc step to Travis
* Tell netlify to build the docs before deploying
* Add Gemfile for Ruby prerequisites and Makefile
* Makefile uses tabs, not spaces
* Build ruby-doc and then gitdocs
* Add recent Ruby version to make sure yard plugins work
* Switch Ruby to a pre-built version inside Netlify
* Add ActiveRecord for the yard-activerecord plugin
* Add Ruby doc header link and info to build it locally
