环境：node 6.9.5 npm 3.10.10
问题一：Module build failed: TypeError: Path must be a string. Received undefined
解决办法：
1.node降低到v5.11.1
2.升级babel-core^6.10.4
详细参考：
https://github.com/webpack/webpack/issues/2463
问题二：Module not found: Error: Cannot resolve module 'react/lib/ReactMount'
解决办法：
1.回滚react版本
2.移除loader里react-hot
详细参考：http://stackoverflow.com/questions/40652327/module-not-found-error-cannot-resolve-module-react-lib-reactmount