Create-react-app: Improve underlying projects

[gaearon]

We rely on community projects now and we can help drive positive changes in them.
A few ideas:

• WebpackDevServer should emit friendly messages instead of "Bundle is not VALID/INVALID"
• Documentation of ESLint Plugin React rules could be improved with rationale and examples
• It should be possible to remove hot reloading logs

Let’s use this thread to keep track of these improvements.

[lacker]

npm could be faster.

[gaearon]

There’s been some awesome work in this direction, and it continues.
Closing as this issue is not very helpful by itself.