Adds migrations for page events columns#49

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manuelurenah wants to merge 9 commits intomasterfrom

page-events-columns

Commits on Jun 6, 2019

Adds migration scripts to add new columns
manuelurenah
committed

Commits on Jun 14, 2019

Modifies putMeta to handle publish events columns
manuelurenah
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Commits on Jun 17, 2019

Fixes test cases for new changes
manuelurenah
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Commits on Jun 26, 2019

Applies PR code review feedback
manuelurenah
committed

Commits on Jun 27, 2019

Commits on Jul 1, 2019

Fixes typo in republished_at migration script
manuelurenah
committed

Commits on Jul 5, 2019

Refactors migration scripts
manuelurenah
committed