Migrate to new cloud code interfaces

removes job status object, moves messasge method on req object

Adds 3.0.0 migration guide

Fixes nits about 3.0.0 documentation

Adds update guide to README

spec/ParseUser.spec.js

@@ -1615,7 +1615,7 @@ describe('Parse.User testing', () => {
 
   it('should have authData in beforeSave and afterSave', async (done) => {
 
-    Parse.Cloud.beforeSave('_User', (request, response) => {
+    Parse.Cloud.beforeSave('_User', (request) => {
       const authData = request.object.get('authData');
       expect(authData).not.toBeUndefined();
       if (authData) {
@@ -1624,10 +1624,9 @@ describe('Parse.User testing', () => {
       } else {
         fail('authData should be set');
       }
-      response.success();
     });
 
-    Parse.Cloud.afterSave('_User', (request, response) => {
+    Parse.Cloud.afterSave('_User', (request) => {
       const authData = request.object.get('authData');
       expect(authData).not.toBeUndefined();
       if (authData) {
@@ -1636,7 +1635,6 @@ describe('Parse.User testing', () => {
       } else {
         fail('authData should be set');
       }
-      response.success();
     });
 
     const provider = getMockFacebookProvider();
@@ -2341,9 +2339,8 @@ describe('Parse.User testing', () => {
   });
 
   it('should cleanup null authData keys ParseUser update (regression test for #1198, #2252)', (done) => {
-    Parse.Cloud.beforeSave('_User', (req, res) => {
+    Parse.Cloud.beforeSave('_User', (req) => {
       req.object.set('foo', 'bar');
-      res.success();
     });
 
     let originalSessionToken;
@@ -2540,9 +2537,9 @@ describe('Parse.User testing', () => {
   });
 
   it('changes to a user should update the cache', (done) => {
-    Parse.Cloud.define('testUpdatedUser', (req, res) => {
+    Parse.Cloud.define('testUpdatedUser', (req) => {
       expect(req.user.get('han')).toEqual('solo');
-      res.success({});
+      return {};
     });
     const user = new Parse.User();
     user.setUsername('harrison');