It turns out that the API method that was supposed to restart the web GUI in FreeNAS 11.1 didn't work. The devs have added a new method with 11.1-U2, which this update uses. I've also moved the code to GitHub; the button will take you to its page, but the easiest way to grab the script itself is to do:
fetch https://raw.githubusercontent.com/danb35/deploy-freenas/master/deploy_freenas.py