Create a Extension for handling Server State assertion during normal Servlet/JSF requests

The general requirements would be:

• hook into existing lifecycle callbacks from server (after_render, request_destory)
• inject and assert on state during request in container
  • we want this to happen during request so all state is still available (@RequestScope)
• assert on output on client side
  • this limits the need for incontianer deps / packaging

Rough API idea/draft:
https://gist.github.com/1184904

If we can piggyback the ServerState Assertion object to 'any' HTML request, we should be able to reuse existing tools for client testing like htmlunit / selenium, but with incontainer assertions.

This could be JSFUnit 3+ combined with a Serlvet Extension.