New API for dealing with writing output, which should be immune to chunked vs. not chunked and also to changes in Netty's channel API;  some logging stuff (more to come);  misc cleanup of Netty 3.xisms in ServerImpl.  Give URL the ability to expose path and query portion only.
Remove a dep from acteur util; more server cleanup
Since no executor service to shut down (but it may have been used elsewhere), interrupt the thread group on shutdown