Allow one to use his own `SSLContext` or at least the `SSLContext.getDefault()`

As said in title, it would be great if instead of hard codding a path to a keystore and trustedKeystore we could use our own `SSLContext` (for instance with certification validation turned off for local development) or at least the default one so we don't have to get a root certificate from our issuer and create a trustedKeystore by hand!