Correct manual proxy documentation

* Class fields to stage 3

Per 2017.07.27 TC39
https://github.com/tc39/proposals/commit/0bbbb08c3cdcc986d59b21782b70633329546042

* Be explicit that only the public part of the unified field proposal is available.

* Debugging in WebStorm

* Fixed formatting for shortcuts

* Added note about default URL

The service was rebranded to xervo.io and was completely shut down in April 2017

Fixing a small typo.

* format UglifyJs error

* move formatBuildError to react-dev-utils

* fix readme

* use regex for plucking the path from stack

* make path human readable and fallback to show error if regex not matched

* rename to printBuildError and add link to the docs

* fix link indentation

* improve readibility + shorten link

Closes #2713

* Docs for react-router v4 basename feature

Fix https://github.com/facebookincubator/create-react-app/issues/2593

* Update README.md

* Update README.md

* Update README.md

* Update README.md

Glob support has been added in source-map-explorer@1.4+

"Styleguidist combines of a style guide, ..." --> "Styleguidist combines a style guide, ..."

* Add more info about apache client side routing

After a revelation in https://github.com/facebookincubator/create-react-app/issues/2593#issuecomment-311729534

* Update README.md

* Add json and css to lint-staged in template README

This changes the proposed way about using prettier inside the README.md, because prettier supports css since the 1.4.0 release and json since the 1.5.0 release. 

Was not sure if it was a good idea to add different regexes for json and css inside the README.md don't have a real opinion about it myself, could maybe easier for starters to do so if they wan't to add things like eslint or stylelint the the commit hooks.

* Use capitalization for Javascript, CSS and JSON

* Change 'Javascript to JavaScript'

* Minor code style edits to user guide

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Don't ask to install webpack for using Styleguidist

* Update README.md

* Added instruction on how to install Prettier

* Tweak style

* Update README.md

* Update README.md

* Support JSX

* Update README.md

* Update README.md

In the section about npm run build fails in troubleshooting added more
info about memory usage of the build script and a link to a tutorial for
adding more swap space as a viable solution.

* Update docs with WebSocket proxy information

* Tweak wording

Due to many of the other examples in the README showing both `npm` and `yarn` commands.
I have added an example of how to install a dependency using `yarn`.

* docs: added REACT_EDITOR to `Advanced Configuration` section

* Update README.md

* Update launchEditor.js

* add docs for setting up CircleCI for CRA

* Reword

* Adding link to tutorial on code splitting

Link to tutorial on Code Splitting with React Router

* Update README.md

It should be `baz` instead of `bar` on last example.

* Update README.md

Fix broken link to React Router documentation

* Update README.md

- Call `npm run flow --init` won't create a .flowconfig file, it should be `npm run flow init`

* re-add storybook && update the documentation and links

* Change to new documentation domain

Removed Node v4 (CRA only supports Node >= 6)

"ensuring that you web app" ->
"ensuring that your web app"

since CRA now use the latest version of Jest under the hood,
`jest-enzyme` v3.2.0 is now working perfectly fine

Simplified steps for deploying app to `now` as a static site. No need to `serve` script in `package.json` file. As of May 15, 2017, all static deployments on `now` are free and unlimited.

* Disable host check if you don't use proxy

* Add a way to opt out and document it