Drop configure-pg-env.sh.

configure-pg-env.sh does not support keyword/value connection strings
http://www.postgresql.org/docs/current/static/libpq-connect.html#LIBPQ-CONNSTRING
while psql can parse both (k/v and url) when supplied on the cmdline.
Removing stale pdf.

https://botbot.me/freenode/gittip/msg/9469193/
Merge pull request #1930 from gittip/drop-configure-pg-env

Drop configure-pg-env.sh.