We encountered an issue on an app using 12.12.x where we needed the
payloads from `repo.parallel` when it completed. This commit upstreams
that change.

This commit updates repo.parallel such that it can accept plain
JavaScript objects. In this case, the return payload is an object
who's keys match the shape provided.

This also allows generator actions to yield objects

* trial 1 for locked scroll behavior

* trying out two columns layout

* experimenting with react-intersection-observer

* set up IntersectionObserver and have it pull from json file

* restructured base layout for new design and did basic styling

* implementing intersection observer to change text on scroll

* added functionality to change view by button and started refactoring

* tweaked Intersection Observer to run smoother, added third section

* removed unnecessary comments

* remove comment

* ran yarn format

* fixed weird formatting by yarn

* fixed more weird formatting by yarn

* tweaking based on PR comments

* finished refactoring to change classnames on rerender

* refactored to rerender based on one state property only

* changed var name to be more clear

* got rid of unnecessary ids

* ran yarn format

* removed prettier as dev dependency and ran yarn format

* Ch/bg color change (#456)

* Ch/layout (#457)

* Ch/qa scrolling (#458)

* moved polyfill inside componentDidMount

* trying new way to import polyfill

* trying out new design mobile

* tweaked side nav to work on scroll

* added correct file for arrow svg and tweaked padding

* added arrow to graphic

* refactored to export out side nav

* ran yarn format

* refactored to use state to add classname

* refactored to store a map that holds DOM elements

* refactored json file to be used for side nav

* refactored how we pull in images using gatsby docs

* color for text and buttons change on scroll

* added all dummy text. refactored how colors change

* refactored color loops in scss

* small tweaks

* ran yarn format

* add icons, minify images (#465)

* add intro and conclusion sections (#466)

* add browser graphic (#467)

* added lazy-sizes lib

* added lazy loader styles and fixed some svg things that were causing console errors

* trying new plugin

* yarn format

* removed other plugin, tweaked scss

* started refactoring to allow for adding classes on update

* added functionality to fade graphics on scroll

* refactored header to use same fade animation as content

* made small tweaks and ran yarn format

* renamed file

* refactored animation

* tweaked anim timing

* refactored fade thresholds and scss

* refactored how animations are done, animated subheadings and button

* ran yarn format, refactored to use class instancence props

* set up flip animations (#472)

This commit adds back patch and reset as deprecated API calls. This is
for backwards compatability with Microcosm 12.x.

This commit allows Subjects to be completed with a payload. This
improves ergonomics and compatability with usage in Microcosm 12.x.

The drawback to this approach is that an extra action status is
dispatched. I have alleviated that by adding a `filter` method to the
Observable prototype that Domains use to avoid dispatch if an action
update has no impact on their state.

This actually ended up being a greater efficiency update than I
anticipated, allowing me to unskip a few tests.

This commit adds back the max history option to Microcosm, a feature
of 12.x that controls how many actions Microcosm's history should hold
on to.

This is zero by default in order to prevent memory leaks. However some
apps (like email editors we have built in the past) may desire to hold
on to a set number of actions for undo/redo and reporting features.

* Upgrade build dependencies
* Bump CircleCI node image to 8.10
* Address minification bugs upgrading Uglify

The scheduler is a critical piece of Microcosm 13, and it didn't have
any flow type coverage.

Adding flow types uncovered a bug where Observable was accessing the
scheduler's error handler from the wrong namespace.

The observable test to confirm proper error reporting uses an internal
API. As such, it must be marked as a dev-only test.

This commit changes the way Subjects and Microcosm action resolution
handle promises such that the error state is passed into the second
argument of `promise.then()`.

This prevents a case where callbacks following the success case could
raise an exception, but it would be trapped by the `.catch()` API call.