Note that for multi-user systems this is entirely useless. For a single user system however, it's helpful because IPFS will automatically be started at boot and always be at the ready without resorting to running it in a screen process.
To install ipfs as a daemon, simply run:
./install-ipfs.sh
I also included a script that enables you to easily update ipfs. That can be run with:
./update-ipfs.sh
Note that these don't require being ran as root, but will instead later ask for root permissions.
You'll be able to later start and stop the daemon with the command:
sudo service ipfs start/stop/restart