Update TestApp and DemoApp to RN v0.57

[dhei]

1. With v0.57, the following npm install warnings are no longer there in TestApp and DemoApp. (See RN v0.57 upgrade documentation):

Installing other packages...
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @babel/[email protected] requires a peer of @babel/[email protected] but none is installed. You must install peer dependencies yourself.

2. Remove hack in android build.gradle for [Android] Requiring images with Gradle 4 fails release builds  facebook/react-native#16906
3. Check in package-lock.json to ensure consistent npm dependency resolution

[guperrot]

Try removing workaround in android build.gradle and check it builds on AppCenter (release type) with tab icons for Android.

[guperrot]

Previous version too, since SDK does not require a change I would not document that?