Convert Create/Edit Column pages to dialogs

Summary: Makes these pages a dialog endpoint, keeping you on the Workboard when possible.

Test Plan: Create a Column, Edit a Column, visit hard page. Test letters in the points field.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D15270

src/applications/project/controller/PhabricatorProjectBoardViewController.php

@@ -692,7 +692,7 @@ final class PhabricatorProjectBoardViewController
       ->setName(pht('Add Column'))
       ->setHref($add_uri)
       ->setDisabled(!$can_edit)
-      ->setWorkflow(!$can_edit);
+      ->setWorkflow(true);
 
     $manage_items[] = id(new PhabricatorActionView())
       ->setIcon('fa-exchange')