Herald - add support for task priority

Summary: adds a new FIELD and a new VALUE to support this. Slightly dodgy because priorities do not have phids so we have to special case how we handle this in a few spots. Ref T4294.

Test Plan: made a new rule to get cc'd on unbreak now and wishlist tasks. verified got cc'd correctly and not cc'd correctly.

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4294

Differential Revision: https://secure.phabricator.com/D8156

resources/celerity/map.php

@@ -370,7 +370,7 @@ return array(
     'rsrc/js/application/files/behavior-icon-composer.js' => 'ea38f732',
     'rsrc/js/application/files/behavior-launch-icon-composer.js' => '6ec125a0',
     'rsrc/js/application/harbormaster/behavior-reorder-steps.js' => 'b21125a5',
-    'rsrc/js/application/herald/HeraldRuleEditor.js' => '4366c8cc',
+    'rsrc/js/application/herald/HeraldRuleEditor.js' => '4f31d692',
     'rsrc/js/application/herald/PathTypeahead.js' => 'f7fc67ec',
     'rsrc/js/application/herald/herald-rule-editor.js' => '7ebaeed3',
     'rsrc/js/application/maniphest/behavior-batch-editor.js' => '391457d7',
@@ -514,7 +514,7 @@ return array(
     'diviner-shared-css' => 'be90f718',
     'global-drag-and-drop-css' => '697324ad',
     'herald-css' => '59d48f01',
-    'herald-rule-editor' => '4366c8cc',
+    'herald-rule-editor' => '4f31d692',
     'herald-test-css' => '2b7d0f54',
     'inline-comment-summary-css' => '14a91639',
     'javelin-aphlict' => '493665ee',
@@ -1054,19 +1054,6 @@ return array(
       0 => 'javelin-install',
       1 => 'javelin-event',
     ),
-    '4366c8cc' =>
-    array(
-      0 => 'multirow-row-manager',
-      1 => 'javelin-install',
-      2 => 'javelin-typeahead',
-      3 => 'javelin-util',
-      4 => 'javelin-dom',
-      5 => 'javelin-tokenizer',
-      6 => 'javelin-typeahead-preloaded-source',
-      7 => 'javelin-stratcom',
-      8 => 'javelin-json',
-      9 => 'phabricator-prefab',
-    ),
     '441f2137' =>
     array(
       0 => 'javelin-behavior',
@@ -1110,6 +1097,19 @@ return array(
       1 => 'javelin-dom',
       2 => 'javelin-reactor-dom',
     ),
+    '4f31d692' =>
+    array(
+      0 => 'multirow-row-manager',
+      1 => 'javelin-install',
+      2 => 'javelin-typeahead',
+      3 => 'javelin-util',
+      4 => 'javelin-dom',
+      5 => 'javelin-tokenizer',
+      6 => 'javelin-typeahead-preloaded-source',
+      7 => 'javelin-stratcom',
+      8 => 'javelin-json',
+      9 => 'phabricator-prefab',
+    ),
     '4f344388' =>
     array(
       0 => 'javelin-install',