Add include mechanism to Groovlets and GSP's similar as the jsp:include.
As discussed on http://www.nabble.com/Groovlets-and-layouting-td23047636.html
I've attached a patch to add includes, forward and redirect functionality.
Also removed setVariables to AbstractHttpServlet.
I think I'll managed to apply those changes, but for further "patches", could you really make them in the form of diffs and not as the original Java files modified?