* Resolved issue #2971
- changed h2 to h1 in template to adhere to accessibility guidelines.
- Added h1 styles to maintain same font size.
* Added header tag to template
Corrected templete to use semantically correct header tag for header instead of div
* Added className for App-title
- Added className="App-title" to h1 tag
- Changed CSS selector to target class instead of element
* sw-precache-webpack-plugin, SW registration, manifest.json
* Documentation + a few SW tweaks.
* Added an unregister method, too, just in case.
* More info for the READMEs.
* Add minify to SWPrecacheWebpackPlugin config
* Fix SWPrecacheWebpackPlugin typo
* Fix file references in READMEmd
* Add instructions for testing service-worker locally
* Review feedback
* Some additional PWA metadata
* Use sw-precache-webpack-plugin v0.9.1 for node >=4.0.0 support
* Review feedback.
* Add manifest.json context in a comment.
* Fix typo
* Downgrade to sw-precache-webpack-plugin 0.9.1
* Hide changes in README until 1.0
* Hide changes in User Guide until 1.0
* Hide more docs
* 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
