Remove JMS functionality from the RichFaces showcase

The RichFaces showcase currently includes a demo of RichFaces push backed by JMS. The JMS security configuration however is not portable, and leads to difficulties in running the RichFaces showcase in other containers.

We target the showcase at demonstrating component capabilities, and leave the JMS integration to be demonstrated as a developer example. The caveat here is that we do a better job promoting the availability of our developer examples.