Support direct access server option (#5550)

* Support direct access config

test options

* add test

* fix test

* fix definitions

* improve docs

* Update .travis.yml

* Revert "Update .travis.yml"

This reverts commit 407f1384953b64bad9e63068db8564c3584ca3a4.

spec/index.spec.js

@@ -498,6 +498,16 @@ describe('server', () => {
       .catch(done.fail);
   });
 
+  it('should allow direct access', async () => {
+    const RESTController = Parse.CoreManager.getRESTController();
+    const spy = spyOn(Parse.CoreManager, 'setRESTController').and.callThrough();
+    await reconfigureServer({
+      directAccess: true,
+    });
+    expect(spy).toHaveBeenCalledTimes(1);
+    Parse.CoreManager.setRESTController(RESTController);
+  });
+
   it('should load a middleware from string', done => {
     reconfigureServer({
       middleware: 'spec/support/CustomMiddleware',