Someone seems to have deleted the install script, and i can't even find where in the history it happened.

It took me a little while to realize that i needed to make it executable after downloading (the sudo version). The code should probably be replaced with:

sudo cd /usr/bin && curl "http://humanual-sv.appspot.com/static/install" -o human && chmod +x human

It should be possible to add commands (or even phrases, such as "How do you fly?") to the DB, not just those in the hard-coded list.