Nested routers don't process commonHandlers in order

[sumitsarkar]

If we use nested routers each with their own set of commonHandlers, the middleware of the deepest router executes first.

it('Should process middlewares in order', function (done) {
      var v1 = new Router();
      var auth = new Router();
      var register = new Router();

      var first = function (req, res, next) {
        req.test = [1];
        next();
      };

      var second = function (req, res, next) {
        req.test.push(2);
        next();
      };

      var third = function (req, res, next) {
        req.test.push(3);
        next();
      };

      register.post('/register', function (req, res, next) {
        res.send({status: 'success', name: req.body.name, commonHandlerInjectedValues: req.test});
        return next();
      });

      auth.use(second, third)
      auth.add('/auth', register);
      v1.use(first)
      v1.add('/v1', auth);

      v1.applyRoutes(server);

      request(server)
        .post('/v1/auth/register')
        .set('Content-Type', 'application/json')
        .send({name: 'test'})
        .expect(200)
        .end(function (err, res) {
          if (err) {
            return done(err);
          }

          res.body.should.deep.equal({status: 'success', name: 'test', commonHandlerInjectedValues: [1,2,3]});
          done();
        });

    });

The test case would fail.