Description of problem:
The default nodejs app's server.js contains this route def:
        self.routes['/health'] = function(req, res) {
            res.send('1');
        };

but it's being handled at the proxy so isn't routed to the app's /health handler.  We should remove it as it's confusing for users to try to modify the return value but it's not being reflected on http://$app_url/health

Note that both nodejs-0.6 and nodejs-0.10 contains the same so if we remove/modify this, we need to do so on both cartridge versions.