Change to support BindingProvider so it can be accessed by Client Code.

We are currently attempting to use your plugin to integrate with NetSuite http://www.netsuite.com using their SOAP interface.  This SOAP interface uses a JSESSION Cookie Stored in the web service session to support authentication.  Not a complicated implementation I know but it is the only NetSuite interface we can use.
If we just use straight apache-cxf in Grails with Spring I would create a bean using JaxWsProxyFactoryBean to configure it up and then inject the resulting bean into my application.  Then inside my grails application when I accessed the Client I would be able to call:

BindingProvider bindingProvider = (BindingProvider) myWebServiceClient
bindingProvider.getRequestContext().put(BindingProvider.SESSION_MAINTAIN_PROPERTY, "true")