Rename HttpClientResend to HttpClientResendCount, HttpRouteHolder to HttpServerRoute. This is indented to keep the names' of these classes as close to the attribute names as possible; with the addition of Client/Server parts.

The HttpRouteSource and its values should also be renamed to remove mentions of servlets (e.g SERVER_FILTER, SERVER, CONTROLLER, NESTED_CONTROLLER) -- this is supposed to be a generic API.