Summary:
Adding jest and its presets to the react-native init command
**Test plan (required)**
run react-native init foo (using `npm link` to use the local `react-native` version)
inside foo there are now a .babelrc file and the package.json is set up as described by
https://facebook.github.io/jest/docs/tutorial-react-native.html#setup
Closes https://github.com/facebook/react-native/pull/9719
Differential Revision: D3843037
Pulled By: bestander
fbshipit-source-id: 004e27ebd3f257a202ed43f378d6fe6cc23ced52
kentaromiura