Web apps work in jetty in trunk

[David Jencks]

A few days ago I had the welcome app working in jetty with precompiled  
jsps.  After some local changes to base ServletContext.getResource on  
bundle.getEntry() I now have the welcome app working without  
precompiled jsps.  There are a few failing tests since getEntry is not  
implemented in MockBundle, I'll commit after figuring out how to  
implement this method.

Welcome files don't seem to be working yet though.
After finishing this up I plan to work on pluto.

thanks
david jencks