Based on:
- https://deliciousbrains.com/ssl-certificate-authority-for-local-https-development/
- https://gist.github.com/jfloff/5138826#gistcomment-2131538
- https://gist.github.com/jfloff/5138826#gistcomment-2145381
- Generate a private key:
openssl genrsa -des3 -out localhostCA.key 2048