Add Basic Auditing Functionalities

Summary:
add basic auditing functionalities. For the related commits for a
package, we detect the following conditions which might be suspicious to the
owners of the package:

* no revision specified
* revision not found
* author not match
* reviewedby not match
* owners not involved
* commit author not recognized

The owners of the package can change the status of the audit entries by
accepting it or specify concern.

The owner can turn on/off the auditing for a package.

Test Plan:
*  verified that non-owner cannot see the details of the audit and cannot modify
it
*  verified that all the audit reasons can be detected
*  tested dropdown filtering and package search
*  verified really normal change not detected
*  verified accept/concern a commit
*  tested enable/disable a package for auditing
*  verified one audit applies to all <commit, packages> to the packages the
auditor owns
*  verified that re-parsing a commit won't have effect if there exists a
 relationship for <commit, package> already

Reviewers: epriestley, nh

Reviewed By: epriestley

CC: aran, benmathews, btrahan, mpodobnik, prithvi, TomL, epriestley

Differential Revision: 1242

src/__phutil_library_map__.php

@@ -371,6 +371,12 @@ phutil_register_library_map(array(
     'ManiphestTransactionType' => 'applications/maniphest/constants/transactiontype',
     'ManiphestView' => 'applications/maniphest/view/base',
     'Phabricator404Controller' => 'applications/base/controller/404',
+    'PhabricatorAuditActionConstants' => 'applications/audit/constants/action',
+    'PhabricatorAuditComment' => 'applications/audit/storage/auditcomment',
+    'PhabricatorAuditController' => 'applications/audit/controller/base',
+    'PhabricatorAuditDAO' => 'applications/audit/storage/base',
+    'PhabricatorAuditEditController' => 'applications/audit/controller/edit',
+    'PhabricatorAuditStatusConstants' => 'applications/audit/constants/status',
     'PhabricatorAuthController' => 'applications/auth/controller/base',
     'PhabricatorCalendarBrowseController' => 'applications/calendar/controller/browse',
     'PhabricatorCalendarController' => 'applications/calendar/controller/base',
@@ -1046,6 +1052,10 @@ phutil_register_library_map(array(
     'ManiphestTransactionType' => 'ManiphestConstants',
     'ManiphestView' => 'AphrontView',
     'Phabricator404Controller' => 'PhabricatorController',
+    'PhabricatorAuditComment' => 'PhabricatorAuditDAO',
+    'PhabricatorAuditController' => 'PhabricatorController',
+    'PhabricatorAuditDAO' => 'PhabricatorLiskDAO',
+    'PhabricatorAuditEditController' => 'PhabricatorAuditController',
     'PhabricatorAuthController' => 'PhabricatorController',
     'PhabricatorCalendarBrowseController' => 'PhabricatorCalendarController',
     'PhabricatorCalendarController' => 'PhabricatorController',