Uses the [`wdiff`](http://www.gnu.org/software/wdiff/) tool as a diffing engine. This produces an output that is more useful for copy-editing tasks. This wdiff comparison is then processed in a way that is aware of markdown formatting. The resulting output attempts to show differences of copy within the final document format (rather than differences of format).
To make the application start on boot, run the following:
pm2 start grunt --name dubdiff -- serve:dist
pm2 startup systemd
pm2 save
[Digital Ocean: How To Set Up a Node.js Application for Production on Ubuntu 16.04](https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-16-04)