Update PGXN URLs to use https.

theory committed Mar 23, 2017

PGXN names are case-insensitive, so `toLowerCase()`.

theory committed Dec 9, 2011

Improve JSON example.

theory committed May 13, 2011

s{jsonp}{callback}g

theory committed May 12, 2011

Document JSONP.

theory committed May 3, 2011