Gruntfile: `grunt serve` listens on 3000
Gruntfile: `grunt serve` listens on 3000

Change the dev server's port to 3000 to make it consistent with the
setting used by `node .`

jouke/loopback-connector-cordova-sqlite,jeffcressman/loopback-example-offline-sync-react,jeffcressman/loopback-example-offline-sync-react,uniconstructor/loopback-example-offline-sync,uniconstructor/loopback-example-offline-sync