AleHu server running under HTTPS

Currently, the focus of the AleHu client developement lies on enabling connections to an AleHu server that runs under HTTPS and whose certificate is not trusted by the standard CAs that come with the JVM's keystore. One possible approach would be to add the AleHu server's certificate to the standard keystore's contents and store this expanded keystore in the client's resources subfolder for further usage. We'll see if this method works out and solves the important requirement of exchanging messages via HTTPS.