[WSS-426] - Support future TTL in the StaX code for Timestamps

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/trunk@1450560 13f79535-47bb-0310-9956-ffa450edef68
Adding a JAAS UsernameToken Validator in the StaX code

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/trunk@1450561 13f79535-47bb-0310-9956-ffa450edef68