Great! I just upgraded it tonight to also support uploading firmware on Linux through Easel as well.
You can start it on boot by running:
(crontab -l ; echo "@reboot cd ~/easel-driver && /usr/bin/screen -dmS easel node iris.js") | crontab
This will add it to crontab, and it can run as a regular user. Please note you need the 'cd' to go to the path where iris.js is -- I'm just assuming you set everything up in your home dir, so it should be in ~/easel-driver which is created by my setup script.