This gist will guide you through the setup of a wildcard Let's encrypt TLS certificate.
Let’s encrypt is one of a new kind of Certificate Authority. You can get a TLS certificate from them for your website free of charge and without any manual overhead. These certificates are trusted in most browsers that are out there and will show up as valid. Instead of sending Mails or even paper around you can call an API and prove your domain ownership with simple challenges. Basically you call the API with a hostname or domain name you need a TLS certificate for and you get back a challenge string that you need to put in a well known location on your http host or as a txt record in your dns system.
You can find many clients that manage the proces