* add react-testing-library documentation/examples

* make react-testing-library a heading

* fix typo

* Adds instructions to create a Bootstrap theme with Sass

* Update README.md

* Update README.md

* Update README.md

* Document importing SVGs as React components

* Update README.md

Replace `src/setupTests.js` with `src/setupProxy.js`.

* Updates to README to reflect Workbox usage.

* Update README.md

* Update README.md

* Add additional troubleshooting for Github Pages

* Update README.md

* changed to Migrate to v2.x

* richer explanation

* Update README.md

This reverts commit 11f1aa09.

Husky had an overhaul of the API, see https://github.com/typicode/husky
Therefore the usage advice here has been adjusted.

follwing -> following

Chrome requests `favicon.ico` on every route change, but stops if the `<link>` for it occurs early enough in the page. [Several](https://stackoverflow.com/questions/35409588/favicon-requested-on-every-route-change) other [people](https://github.com/ctrlplusb/react-universally/issues/145) have been running into this issue since at least February 2016.

* convert mocha tests to jest

* jest 23

* add jest configs

* use material css

* fix windows

* forceExit jest test

* force exit eject

* test

* test

* retrigger test

* remove appveyor comment

* try to remove pretendToBeVisual option

* use jsdom env

* test environment

* no cache

* test no close

* bring back raf

* test revert all broken changes

* add back jsdom

* remove jsdom

* node test environment

* use latest change

* runInBand

* runInBand

* comment test run

* try different jest option

* standardize jest test options

* increase heap size

* remove heap size config

* support scoped packages for cra --scripts-version option

* upgrade jest version

* fix windows

* fix windows again

* jest 23.4.1

* babel-jest

* babel-jest

* split out kitchhensink

* travis node 6

* travis node 6 config

* node 6 travis eject

* cache yarn

* only cache yarn

* remove unrelated changes

* typo

* Updates to reflect service worker registration being opt-in.

* Fixed an anchor link.

* Updates to SWPrecacheWebpackPlugin config, and corresponding docs.