message: Removed external dependency build warning
  Doesn't matter for react native build because don't run as a standalone file. But will need to think how to handle for mobile because want that to work standalone!?
diff: @@ -21,7 +21,8 @@ var items = [
  'navigation-react': 'NavigationReact', react: 'React' } },
  require('./build/npm/navigation-react-mobile/package.json')),
  Object.assign({ globals: { navigation: 'Navigation', react: 'React',
  - 'navigation-react': 'NavigationReact', 'react-native': 'ReactNative' },
  + 'react-freeze': 'ReactFreeze', 'navigation-react': 'NavigationReact',
  + 'react-native': 'ReactNative' },
  format: 'es' },
  require('./build/npm/navigation-react-native/package.json')),
  ];
  