If you use Fedora, you will soon be able to install supernova via a Fedora package! The packages are currently in the testing repositories but they will soon be available in the stable repositories for Fedora 22, 23, and rawhide.
Want it right now?
If you want to install supernova now, simply tell dnf to install it from the updates-testing repository:
dnf install --enablerepo=updates-testing supernova
supernova in EPEL
A few people have asked for supernova to be added to EPEL, but the version of the click module for python is too old. Getting supernova into EPEL isn’t completely off the table, but it will require some additional work.
Many thanks to Pete and Carl for helping me with the package review and bug fixes.