Giovanni Baleani

During import of an entire graph from my old titan based service, incurred into this exception: ``` java.lang.IllegalArgumentException: com.orientechnologies.orient.core.exception.OSchemaException: Invalid class name found. Character '.' cannot be used in class...

Acqually a client cannot subscribe to a topic and send options like `{"match":"prefix"}`. This patch expose the wamp `options` parameter in `subscribe` method. Here the wamp documentation: https://wamp-proto.org/_static/gen/wamp_latest.html#subscribe-0