Add hosting, serving, and push policy options to repository edit

Summary:
Basically straight from D7391. The differences are basically:

  - Policy stuff is all application-scope instead of global-scope.
  - Made a few strings a little nicer.
  - Deleted a bit of dead code.
  - Added a big "THIS DOESN'T WORK YET" warning.

Test Plan: See screenshots.

Reviewers: hach-que, btrahan

Reviewed By: hach-que

CC: aran

Maniphest Tasks: T2230

Differential Revision: https://secure.phabricator.com/D7416

src/applications/diffusion/application/PhabricatorApplicationDiffusion.php

@@ -75,6 +75,8 @@ final class PhabricatorApplicationDiffusion extends PhabricatorApplication {
             '(?P<edit>remote)/' => 'DiffusionRepositoryCreateController',
             'local/' => 'DiffusionRepositoryEditLocalController',
             'delete/' => 'DiffusionRepositoryEditDeleteController',
+            'hosting/' => 'DiffusionRepositoryEditHostingController',
+            '(?P<serve>serve)/' => 'DiffusionRepositoryEditHostingController',
           ),
         ),
         'inline/' => array(
@@ -110,6 +112,8 @@ final class PhabricatorApplicationDiffusion extends PhabricatorApplication {
       DiffusionCapabilityDefaultEdit::CAPABILITY => array(
         'default' => PhabricatorPolicies::POLICY_ADMIN,
       ),
+      DiffusionCapabilityDefaultPush::CAPABILITY => array(
+      ),
       DiffusionCapabilityCreateRepositories::CAPABILITY => array(
         'default' => PhabricatorPolicies::POLICY_ADMIN,
       ),