* Show warnings for builds

* Move WebpackDevServer helpers into react-dev-utils

* Fixed several of the issues and nits from PR:

* Moved margin between header and file name to header, so when content was scrolled, the header would remain more separate
* Made build-time and runtime overlays better match
* Secondary error <pre> style now uses yellow bg instead of red
* 'Scrollable Header' (see above comment to why this is necessary) but I did increase the max-height from 35% to 50%.
* Fixed header and 'X' button vertical alignment

* Temporary stack margin fix

* Move "N errors" to the top

* Tweaked overlay styles

* Tweaked pre-style

* Clicked to background overlay dismiss

* Tidied up styles tobe more mobile Safari friendly

* Re-enabled pre-wrap

* Margin fixes

* Base font-size 10 -> 11px

* Error overlay is full-screen now based on feedback

* Make "N errors on the page" visible again

* Fix bottom margin of frame location and lack of tab nav

* Add tooltip to close button

* Bring compile error styles closer to runtime overlay

* s/when/if/

* Correct readme

* Add tests

* Update README.md

* 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

* Webpack config typo

* Webpack config more typo

* Add module scope plugin

* Oops

* Add comments

* Check windows seps too

* More descriptive error

* Document it

* Ignore Moment.js locales by default

* Update README.md

* 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