Quick2Wire recently has had some issues with the q2wi.re domain. The installation is still very simple, just a minor URL change on the setup.
Step 1 (add the quick2wire repos):
curl -L https://raw.github.com/quick2wire/quick2wire-software-users/master/setup-apt.sh | sh
Step 2 (install quick2wire-gpio-admin):
sudo apt-get update sudo apt-get install quick2wire-gpio-admin
Step 3 (use it!):