Assemble Adafruit Ultimate device (connecting wifi USB)
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
curl -sSL https://get.rvm.io | bash -s stable
rvm install 2.2.3
Reboot.
We started by following this guide, omitting the secondary button that turns all the lights on/off.