* Override Jest config collectCoverageFrom with package.json

* Protect against overriding other options

* Better error message

* Create Jest config early on eject

* Tweak wording

* Dry it up

* react-dev-utils/openBrowser now supports urls with 2+ params

Fixed #2047

* react-dev-utils/openBrowser: encode url before open the browser

* Bump dependencies

* Bump CSS deps

* Somehow I missed dotenv

* Bump ESLint deps

* Tweak ESLint rules

* Only run tests in <rootDir>/src (#544)

* updates Jest to 19.0.2

* removes testPathIgnorePatterns from jest config

* adds testMatch to jest config to only match files in src

* Bump babel-jest to 19.0.0 to match jest 19.0.2

* Adding postcss-flexbugs-fixes

Using postcss-flexbugs-fixes to fix all flexbug's issues.

* Adding flexbox: 'no-2009' to Autoprefixer

It will add flexbox prefixes only for final and IE versions of
specification.

* Support node scripts in BROWSER

Modify OpenBrowser.js to run node scripts specified with the BROWSER environment
variable . If the value of the BROWSER environment variable ends with '.js' a
child process is spawned to execute the script with node.js. Any
arguments passed to npm start are also passed to this script, as well as
the url where the app is served.
The command executed in the child process is:

node <pathToScript> [OPTIONS] <url>

Update User Guide.

* Tweak code style

* Pin dep

* Comment out 0.10 docs

* Support hoisting react-scripts

* require.resolve() loaders and configs

This makes it so that loaders and configs are resolved relative to the config rather than to the app. This seems to make more sense to me.

Removing a stylistic lint rule

* ESLint Config: Upgrade eslint-plugin-jsx-a11y and activate more rules.

* Try to fix Lerna

* Update README.md

* Remove html-has-lang

* Update README.md

* Unpin Yarn

* Try 0.24.2

* Update e2e-simple.sh

Matches what we did in https://github.com/facebook/react/pull/9679

* Upgrade to Jest 19

* Use testMatch

* Correct version

* Show network address on start

* Tweak visual representation

* Change proxy handling to allow multiple proxies to be specified in package.json.

* Up webpack-dev-server to 2.4.2

Webpack Dev Server version 2.4.2 handles the external websocket upgrade
for all proxies

* Fix the listen() call

* Switch to correct default host

* Remove promises and extract to react-dev-utils

* oops

* Warn for missing braces

* Overlay, too

* Tweak error and warning output

* Add a colon

* Add custom eslint formatter

* Add formatter docs

* Update formatter docs

* Slightly tweak it

* Update README.md

* Temporarily fork detect-port

* Fix get process id

* Use different package

* Unnecessary var

* Blacklist confusing global variables

* Blacklist globals

* Fix kitchensink test to lint

* Edit the list

* Use no-restricted globals for this

Closes #2127