Stork using Go crypto

Stork is based the Go crypto which in theory should not be used in production according to: https://stackoverflow.com/questions/18754190/how-does-crypto-library-in-go-compare-to-openssl/27006738

On the long term if the Go TLS implementation does not get production in security aware environment grade we shall have to switch to OpenSSL but for now I just recommend to explain in the Stork documentation for instance in its introduction that Stork uses the Go TLS code.