npm_and_yarn in /example for @react-native-community/cli, @react-native-community/cli-platform-android, @react-native-community/cli-platform-ios - Update #1531630266

npm_and_yarn in /example for @react-native-community/cli, @react-native-community/cli-platform-android, @react-native-community/cli-platform-ios - Update #1531630266 #1517