Record the decision on Broker and Trigger#862

Merged

knative-prow-robot merged 6 commits intoknative:masterfrom evankanderson:pineapple-rifleman

Mar 14, 2019

+166

Commits on Mar 7, 2019

Initial definitions of Broker and Trigger based on decision docs
evankanderson
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Commits on Mar 14, 2019

Update with @katfang wording
evankanderson
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