Implement "Group by Owner" on Workboards
Summary: Depends on D20269. Ref T10333. Now that orderings are modularized, this is fairly easy to implement. This isn't super fancy for now (e.g., no profile images) but I'll touch it up in a general polish followup.
Reviewed By: amckinley
Maniphest Tasks: T10333
Differential Revision: https://secure.phabricator.com/D20270