Don't require project edit permission to create a project with members other than yourself

Summary: See PHI193. Previously, see similar D18763. Skip this legacy-style policy check when creating a project, since we know you can add members, even if the policy doesn't actually resolve in your favor.

Test Plan:
  - Created a project with edit policy "Members of project" and myself, plus any other user (so the code goes down this path, not the "join/leave" path) as members.

Differential Revision: https://secure.phabricator.com/D19169

src/applications/project/editor/PhabricatorProjectTransactionEditor.php

@@ -156,12 +156,15 @@ final class PhabricatorProjectTransactionEditor
                   PhabricatorPolicyCapability::CAN_EDIT);
               }
             } else {
+              if (!$this->getIsNewObject()) {
                 // You need CAN_EDIT to change members other than yourself.
+                // (PHI193) Just skip this check if we're creating a project.
                 PhabricatorPolicyFilter::requireCapability(
                   $this->requireActor(),
                   $object,
                   PhabricatorPolicyCapability::CAN_EDIT);
               }
+            }
             return;
         }
         break;