A quick note, the bottom of that script has this section:

  if [ "$COMPASS" -eq 0 ]; then
    echo ""
    echo "Install hiccup: no compass"
    echo "Sorry chap, compass wasn't setup because there was a problem with your ruby setup. You can check the documentation here for help: [link to documentation]."
  fi

You should probably make that an actual link for when people have problems.

Very nice install script by the way, you clearly had a lot of fun making it.