Don't look for babelrc file during test (facebook#1017)

Author: nhajidin

packages/react-scripts/config/jest/transform.js

@@ -9,5 +9,6 @@
 const babelJest = require('babel-jest');
 
 module.exports = babelJest.createTransformer({
-  presets: [require.resolve('babel-preset-react-app')]
+  presets: [require.resolve('babel-preset-react-app')],
+  babelrc: false
 });