gnupg2 2.0.23

Update to latest stable release, update patch, change single quotes to
double quotes, and use https on the homepage link.
gpg-agent 2.0.23

Update to latest stable release, update patch, change single quotes to
double quotes, and use https in homepage link.
gnupg2: add 2.0.23 bottle.
gpg-agent: add 2.0.23 bottle.