Soap whiteboard

Git branch: track6

The soap whiteboard uses the JAX-WS Reference implementation included in Java 8 SE.
Basically the implementation can be used directy with its builtin HTTP server, using Endpoint.publish and a different port number than the one used by the HTTP service. Integrating the Reference Implementation with the HTTP service is bit more complicated. Using the spi interface we can route the SOAP request to a normal servlet. The implementation also adds a RolesAllowed feature for securing the web service against unauthorized access.