Add greater flexibility around Editors/Publishers

[engram-design]

Such as, having both as the same user, selecting specific recipients.

Also adding notes to editor.

[RobErskine]

Hey Josh. Loving this plugin, thanks for all the work on it.

Just wanted to piggyback on this ticket for a feature request/enhancement. It would be great to have more control with user groups outside of editors and publishers. It would be great to create custom roles and have content filter through a funnel, such as:

Editor -> Proofreader -> Editor
or more complex:
Copywriter -> Designer -> Proofreader -> Merchant -> Publisher

Thanks again,
Rob

[saschapi]

And one more piggyback:

Having the option to have different Groups as Editor and Publisher for different Entry types would be a big advantage. Currently this will stop us from using it.

[Alxmerino]

Yes, I would also love to piggyback on this as well!

[engram-design]

@RobErskine This has been added in 1.5.0 in the form of Reviewers.

@saschapi @Alxmerino I'm opening a separate issue for your FR, as this one is a bit vague or just greater flexibility - see #114