Release of getcerts.sh, version 2.0

getcerts.sh

The wrapper getcerts.sh is an all-in-one solution to create private keys,
generate a signing request (csr) and obtain certificates from Let's Encrypt
for multiple domains. And, of course, subject alternative names are supported.

Furthermore, the script can install (new) certificates and restart the web server.

New certificates can be requested and installed without any downtime. The only
downtime needed, is to activate the (new) certificates.

The wrapper getcerts.sh is based upon the excellent work done by Daniel Roesler and Jon Lundi.