* 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/

* Prettify errors and warnings for Webpack 2

* Update formatWebpackMessages.js

* 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

* Add red box prototype

* Unmount fail node when hot-reloaded (future proofing)

* Slightly improve error reason

* Add Chrome unhandledrejection listener

* Close red box when Escape is pressed

* Construct our own source if not available

* Resolve sourcemaps for friendlier traces

* Allow error to be scrolled

* Only utilize sourcemaps, not the magic. :(

* Make view similar to React Native

* Fix an uncaught syntax error

* Add workaround for Firefox 50

* Add a hint for closing the prompt

* Multiple error support
When there's multiple errors, simply state that there are more instead of re-rendering

* Log any renderer error

* Dim node_modules in display

* Override chrome stack trace limit

* Magic: show me some source!

* Add ability to toggle internal calls

* Switch text from show -> hide

* Change color scheme to something easier on the eyes

* Change UI to be friendlier (thanks @nicinabox)
https://github.com/facebookincubator/create-react-app/pull/1101#issuecomment-263621057
https://github.com/facebookincubator/create-react-app/pull/1101#issuecomment-263636171

* Update styles

* Add container inside overlay

* Apply pre style

* Add line highlight

* Add omitted frames ui

* Move yellow to var

* Do all function names in black

* Adapt container based on screen size

* Extract ansiHTML

Use base16-github theme

* Linting

* Add syntax highlighting of errors

* Linting

* Remove white background

* Append new files to package.json

* Target exact version

* White is a little harsh, use same color as red box.

* Fix a bug where omitted frames would never be rendered
(under certain circumstances)

* Show local file path instead of confusing webpack://

* Do not require the entire file

* Remove css file

* Use context size, not a magic variable.

* Fix title regression

* Update dependency

* Do not center text for internal calls

* Temporarily disable links

* Switch internal toggle to 'i'

* Remove unnecessary rules from container style

* Reduce omitted frames font size

* Fix font family in pre > code

* Re-introduce line highlighting

* Object.<anonymous> -> (anonymous function)

* Add ability to see script source

* Add missing ansi mappings

* Remove SIAF

* Skip native functions

* Extract hints div function

* Extract renderers

* Refacor var names

* If source is disabled, don't use the line.

* Allow toggle between source

* Allow bundles to be expanded

* Wow, how did I let this one slip?

* Toggle text for UX/DX

* Make it so clicking Close unmounts the error component

* Do not allow hot reloading once an error is thrown

* Do not wrap lines for small displays

* Fix toggle when additional errors happen

* Make the close a button

* Capture and store errors

* Dispose on render; move additional logic

* Only make code not wrap

* Switch to a view-by-index method

* Allow user to switch between errors with arrow keys

* Fix text while switching between errors

* Update close button style

* Render additional errors at top

* Add left and right arrows

* Make frames pointy

* UTF-8 arrows

* Don't mount unneeded DOM node

* Switch to single changing text for compiled <-> source

* Don't display arrows with only one error.

* Collapsed and expanded

* Make sure the last collapse toggle is appended

* Do not show the stack trace if it doesn't resolve to a file we wrote

* Style container with media queries

* Do not allow x overflow; break words by default.

* Trim off whitespace of lines

* Remove padding since it's not outer-most

* Add footer message

* Extract css file to JS

* Only inject the css when the overlay is up

* Extract red variable

* Remove env

* Update babel-code-frame

* Set force color to true

* Extract out collapse div logic

* Remove arrow field

* Insert a top collapse

* Make browser friendlier

* Absolutify ^

* Make arrows buttons

* Accessify

* Let there be ES5

* Pretty css

* Use forEach where we can ...

* Remove extracted loop

* Fix IE compatibility

* Capture React warnings

* Add source override via React output parsing

* Whoops, fix arguments to crash.

* es5-ify

* Re-enable e2e-install directory test

* Only rewrite line number if it was resolved and leaves a line at bottom

* Rename failFast to crashOverlay

* Disable console proxy

* Appease linter

* Appease more

* Lint internal scripts with eslint:recommended

* Warnings r bad

Resolves #1508

* Dispose error overlay when linting errors have been corrected

* Fixed spelling error

* Minor style tweaks

* Support webpack 2

* Code style

* Add syntax error overlay in development

* Support HMR being disabled

* Tweak CSS