Repo.parallel can accept objects

[nhunzaker]

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

function getPost (id) {
  return fetch(`/posts/${id}`)
}

function getComments (id) {
  return fetch(`/posts/${id}/comments`)
}

function getPostWithComments (id) {
  return function * (repo) {
    let { post, comments } = yield { post: repo.push(getPost, id), comments: repo.push(getComments, id) }
    
    post.comments = comments

    return post
  }
}

repo.push(getBlogPost, 1)

[codecov-io]

Codecov Report

Merging #452 into repo-parallel-upstream will increase coverage by 0.52%.
The diff coverage is 72.72%.

@@                    Coverage Diff                     @@
##           repo-parallel-upstream     #452      +/-   ##
==========================================================
+ Coverage                   95.61%   96.14%   +0.52%     
==========================================================
  Files                          33       30       -3     
  Lines                        1118     1038      -80     
  Branches                      204      199       -5     
==========================================================
- Hits                         1069      998      -71     
+ Misses                         45       36       -9     
  Partials                        4        4

Impacted Files	Coverage Δ
packages/microcosm/src/utils.js	95.89% <0%> (-2.73%)	⬇️
packages/microcosm/src/coroutine.js	48% <0%> (+5.14%)	⬆️
packages/microcosm/src/action.js	99.14% <100%> (+1.7%)	⬆️
packages/microcosm/src/install-devtools.js	66.66% <0%> (-33.34%)	⬇️
packages/microcosm/src/effect-engine.js	94.44% <0%> (-5.56%)	⬇️
packages/microcosm/src/domain-engine.js	97.05% <0%> (-1.48%)	⬇️
packages/microcosm/src/microcosm.js	98.11% <0%> (-0.95%)	⬇️
packages/microcosm/src/addons/action-button.js
packages/microcosm/src/addons/action-form.js
... and 5 more

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