Add YAML to tests, regen _site
Merge pull request #19 from emmaattwell/gh-pages

Merging 'Corrections to images'
Improve image styling options; fix some EPC

Some images and related markdown in EPC ch 3 adjusted to demonstrate new
image styling options. New _site.
Update alternative printing CSS
Merge pull request #20 from emmaattwell/gh-pages

Resizing artboards
Typo in EPC TOC link, update alt print CSS
Author's corrections

Implemented Angela's author's corrections