Move `status` field back directly to commit data in API

doc/api/commits.md

@@ -73,8 +73,8 @@ curl -H "PRIVATE_TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3
   "parent_ids": [
     "ae1d9fb46aa2b07ee9836d49862ec4e2c46fbbba"
   ],
+  "status": "failed",
   "last_build": {
-    "status": "failed",
     "coverage": null,
     "duration": 2,
     "started_at": "2015-12-24T17:54:09.744Z",

doc/api/merge_requests.md

@@ -110,12 +110,12 @@ Parameters:
     ],
     "short_id": "6c14056d",
     "title": "Add some fixes",
+    "status": "running",
     "last_build": {
       "coverage": null,
       "duration": 0,
       "finished_at": null,
-      "started_at": "2012-04-25T13:15:15.000+01:00",
-      "status": "running"
+      "started_at": "2012-04-25T13:15:15.000+01:00"
     }
   }
 }

lib/api/entities.rb

@@ -132,7 +132,6 @@ module API
     end
     class RepoCommitLastBuild < Grape::Entity
-      expose :status
       expose :started_at
       expose :finished_at
       expose :duration
@@ -141,6 +140,7 @@ module API
     class RepoCommitDetail < RepoCommit
       expose :parent_ids, :committed_date, :authored_date
+      expose :status
       expose :ci_commit, as: :last_build, with: Entities::RepoCommitLastBuild
     end