Themis configurations

This is related to this github issue: https://github.com/xmidt-org/themis/issues/56

Looking through the documentation, it is not clear how user enable and configure mTLS on themis. For example, how do I specify the CA/server certs and keys?

Also, is there a way to configure which device get which trust level base on a whitelist of device id?

See thread in GitHub issue.