setup-postgres.sh: script now works even if `pv` is not available
setup-postgres.sh: script now works even if `pv` is not available

The `pv` utility is handy for showing progress information as data is
moved through a Unix pipe, but is not important enough that we should
require that everyone who runs this script locally via go.sh needs to
install it.

ic-labs/django-icekit,ic-labs/django-icekit,ic-labs/django-icekit,ic-labs/django-icekit