Treat NotFound as a route
Added before hook to martini.ResponseWriter
Merge branch 'master' of github.com:codegangsta/martini
Support http.CloseNotifier interface.
Merge branch 'notfound' of github.com:nbjahan/martini into nbjahan-notfound
Merge branch 'master' of github.com:alecthomas/martini into alecthomas-master