Revision 1810339

WSS-614 org.apache.ws.security.transform.STRTransformProvider leak. This closes #8.

I've created a new module that has a ServletContextListener,
WssServletContextListener. This WssServletContextListener calls
WSSConfig.cleanUp() method when contextDestroyed() is invoked.
I´ve made it in a different module so it could be included in web
applications.

Signed-off-by: Colm O hEigeartaigh <coheigea@apache.org>