Cache the JAXBDataBinding class which make client creation a tiny bit faster (after the first one) and can hopefully fix a potential deadlock issue when using spring-dm to start multiple bundles that have jaxws:client entries.

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1480712 13f79535-47bb-0310-9956-ffa450edef68