REST API

Sticky posts should not be returned at the top of every /posts/ request. Only when requested.

Merges r96510-wpcom.
REST API: add `login` as part of the returned data of the author object in the API

Also adds a test for the new field
see https://[private link]

Merges r96537-wpcom.
REST API: add a new `/users` endpoint that allows the listing of users on a site, as well as just the authors of a site.

Also adds tests to make sure the endpoint works correctly in a variety of scenarios
See https://[private link]

Merges r96541-wpcom.
REST API: in the author return object, make the default for the `login` be an empty string instead of a zero, for consistency's stake

Merges r96543-wpcom.
REST API: move the `is_post_type_allowed()` function to be available for all endpoints as it will need to be reused in several `post` endpoints

All tests continue to pass with this change
See https://[private link]

Merges r96544-wpcom.
REST API / Tests

* stop vip endpoints from failing in production (in_testing only allows them to work on sandboxes. plus there are already access checks and marks for making the endpoints undocumented)
* FP bug: vip post was bumped to FP but couldn't display because it was using a CPT
* fix email one of the tests checks for since the author email is different

Merges r96545-wpcom.
REST API: introduce the ability to modify the post's author when creating or editing a post. The new param accepts the author ID or

Also introduces tests for the new paramater
see https://[private link]

Merges r96553-wpcom.
Merge pull request #495 from Automattic/jkudish-rest-changes

Changes from @jkudish and @justinshreve on the REST API.