Adding jest and jest babel preset to the react-native init command

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

scripts/run-ci-e2e-tests.js

@@ -200,6 +200,11 @@ try {
       exitCode = 1;
       throw Error(exitCode);
     }
+    if (exec(`npm test`).code) {
+      echo('Jest test failure');
+      exitCode = 1;
+      throw Error(exitCode);
+    }
   }
   exitCode = 0;