no issue
- added `PostRevsion` model
- duplicated `mobiledoc_revision` creation routine in Post model's onSaving hook to create `post_revision` when model's `lexical` field has changed
- updated `mobiledoc_revision` creation to skip when `lexical` field is populated
refs TryGhost/Team#1826
- adds a method on user model which fetches all eligible users for a type of email alert
- restricts users to active `Owner` and `Administrators` with setting turned on
refs https://github.com/TryGhost/Team/issues/1727
- if feature flag is enabled, handles storing expiry date on complimentary subscriptions in `expiry_at` column of `members_products`
- updates the expiry value on both member edit or add with tiers
- expiry is passed as `expiry_at` in `tiers` list of a member
- includes `expiry_at` on tiers data of a member when flag is enabled
refs https://github.com/TryGhost/Team/issues/1757
- exposes trial start and end dates in member's subscription object
- allows portal and admin to show member's trial information in UI
refs https://github.com/TryGhost/Toolbox/issues/354
- this commit turns the Ghost repo into a monorepo so we can bring our
internal packages back in, which makes life easier when working on
Ghost
