Fixed compilation error.
Bumped source & target to 1.6.
Upgraded to Jetty 8, excluded the javax.servlet transitive dependency which was putting a servlet 2.5 api on the classpath, resulting in (potential) runtime problems with the 'isAsyncSupported' method on the HttpServletRequest.
Switched to compile instead of provided for the servlet api and ant dependencies.
Switched to project dependency instead of release for the sitemesh example.
Added support for asynchronous response decoration.
Refactoring to support the new Jetty code.