create self-signed cert

https://docs.nodejitsu.com/articles/HTTP/servers/how-to-create-a-HTTPS-server/
```
openssl genrsa -out key.pem
openssl req -new -key key.pem -out csr.pem
openssl x509 -req -days 9999 -in csr.pem -signkey key.pem -out cert.pem
rm csr.pem
```