http://postgis.net/docs/manual-dev/Extras.html#Tiger_Geocoder
Refer to http://postgis.net/docs/manual-dev/postgis_installation.html#install_tiger_geocoder_extension
-for installing and upgarding from extensions.
+for installing, upgrading, and loading data from extensions.
Note that installing by script approach is now deprecated, but covered in:
http://postgis.net/docs/manual-dev/postgis_installation.html#install_tiger_geocoder