Fixes#5333
printFileSizesAfterBuild calls canReadAsset with an object containing
the file name while measureFileSizesBeforeBuild calls it with just the
name. When canReadAsset only receives the name it returns false since
accessing the `name` property results in undefined.
This commit fixes that by having canReadAssset instead expect only the
file name and making printFileSizesAfterBuild just like
measureFileSizesBeforeBuild only provide the name as argument.
If create-react-app project is ejected and webpack configuration is
modified to multi build setup FileSizeReporter would fail.
In those situations `webpackStats` parameter would contain stats array
for each build. This fix will try to access stats and then falls back
to using plaing webpackStats object.
* mv create-react-app/index.js -> create-react-app/creteReactApp.js
* update to modern code style
* var -> cosnt
* set trailing-coma to es5 for prettier
