Issue #253 - Fix to make jaxws-endpoint compile against JDK 8

Change to use org.jvnet.jax-ws-commons:jaxws-maven-plugin:2.3 instead of org.codehaus.mojo:jaxws-maven-plugin:1.11
See https://stackoverflow.com/questions/8763595/maven-jaxws-failed-to-execute-wsgen