[MET-4120] Add required permission_callback argument to REST API register_rest_route

1.9.20

[MET-4120] Add required permission_callback argument to REST API regi…

1.9.19: Merge pull request #22 from jtroynousky/MET-3792

[MET-3792] Liveblog: Do not render items on the client with empty content

1.9.18

1.9.18

1.9.17

1.9.17

1.9.16

1.9.16

1.9.15

1.9.15

1.9.14

1.9.14

1.9.12: Merge pull request #16 from hrkhal/optional-fields

Allowing publishing with any fields.

1.9.11: Merge pull request #15 from hrkhal/strip-styles

stripPastedStyles

1.9.10: Merge pull request #14 from hrkhal/prevent-anchor

Preventing anchor transformation