Add spacing css

Summary: Adds ability to add 20, 10 and 5 px of margin or padding without adding additional rules.

Test Plan: Reloaded any Phabricator Page. It didn't break.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5477

src/__celerity_resource_map__.php

@@ -3585,6 +3585,15 @@ celerity_register_resource_map(array(
     ),
     'disk' => '/rsrc/css/application/config/setup-issue.css',
   ),
+  'spacing-css' =>
+  array(
+    'uri' => '/res/59e4c9b1/rsrc/css/core/spacing.css',
+    'type' => 'css',
+    'requires' =>
+    array(
+    ),
+    'disk' => '/rsrc/css/core/spacing.css',
+  ),
   'sprite-apps-css' =>
   array(
     'uri' => '/res/c53973fc/rsrc/css/sprite-apps.css',

src/view/page/PhabricatorStandardPageView.php

@@ -114,6 +114,7 @@ final class PhabricatorStandardPageView extends PhabricatorBarePageView {
     require_celerity_resource('phabricator-core-css');
     require_celerity_resource('phabricator-zindex-css');
     require_celerity_resource('phabricator-core-buttons-css');
+    require_celerity_resource('spacing-css');
     require_celerity_resource('sprite-gradient-css');
     require_celerity_resource('phabricator-standard-page-view');