* 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/
* Browser sort is not stable
* Fix ordering of final message
* Register the warning capture
* Display only createElement warnings
* Use different method name
* Fix regression
* Ignore errors with only node_module files
* Ignore null files, too
* Revise count
* Revise warning
* Update overlay.js
* Add support for https://github.com/facebook/react/pull/9679
* Use absolute paths
* Trim path if it's absolute
* Make sure it's an absolute path
* Oops
* Tweak for new behavior
* Make it safer
* More resilient warnings
* Prettier output
* Fix flow
* ༼ つ ◕_◕ ༽つ stack-frame-overlay
* Fix linting
* Remove auto overlay
* Fix e2e
* Pull in the rest
* Appease flow
* Correct dep
* Remove old repo references
* Check flow on test
* Test overlay in e2e
* Add cross env
* Rename package
* Make sure it gets built post-install
* Update the README
* Remove extra builds now that there's a postinstall script
* Revert "Remove extra builds now that there's a postinstall script"
This reverts commit 8bf601dbd36c1e0da7f785fa9ade70ab08ed8772.
* Remove broken script
* Fix some dev ergo
