Here's a list of articles to cull:
https://css-tricks.com/visual-regression-testing-with-phantomcss/ https://css-tricks.com/automating-css-regression-testing/ https://davidwalsh.name/visual-regression-testing-angular-applications https://www.phase2technology.com/blog/css-testing-with-phantomcss-phantomjs-casperjs-and-grunt/ http://www.creativebloq.com/web-design/automate-visual-regression-testing-111517944 http://www.gizra.com/content/visual-regression-travis-shoov-ngrok/ http://www.gizra.com/content/shoov-monitor-twitter/ http://www.gizra.com/content/visual-regression-tutorials/ http://www.gizra.com/content/visual-monitor-drupal/ https://www.lullabot.com/articles/css-regression-testing-with-resemblejs
Maybe (a little out of date though): http://blog.kevinlamping.com/easy-ui-regression-testing-with-wraith-and-travisci/