Add a "default view" policy to Differential

Summary:
Ref T603. Allows the Differential view policy to be configured with a default.

I've omitted "edit" because I want to wait and see how comment/comment-action policies work out. I could imagine locking "edit" down to only the owner at some point, and providing a wider "interact" capability, or something like that, which would cover accept/reject/commandeer. Users in this group could still edit indirectly by commandeering first.

Test Plan: Created new revisions from the CLI and conduit.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D7269

src/applications/differential/controller/DifferentialRevisionEditController.php

@@ -32,8 +32,7 @@ final class DifferentialRevisionEditController extends DifferentialController {
         return new Aphront404Response();
       }
     } else {
-      $revision = new DifferentialRevision();
-      $revision->attachRelationships(array());
+      $revision = DifferentialRevision::initializeNewRevision($viewer);
     }
 
     $aux_fields = $this->loadAuxiliaryFields($revision);