api: expose work_in_progress flag

doc/api/merge_requests.md

@@ -49,7 +49,8 @@ Parameters:
       "state": "active",
       "created_at": "2012-04-29T08:46:00Z"
     },
-    "description":"fixed login page css paddings"
+    "description":"fixed login page css paddings",
+    "work_in_progress": false
   }
 ]
 ```
@@ -94,7 +95,8 @@ Parameters:
     "state": "active",
     "created_at": "2012-04-29T08:46:00Z"
   },
-  "description":"fixed login page css paddings"
+  "description":"fixed login page css paddings",
+  "work_in_progress": false
 }
 ```
 
@@ -118,6 +120,7 @@ Parameters:
   "project_id": 4,
   "title": "Blanditiis beatae suscipit hic assumenda et molestias nisi asperiores repellat et.",
   "description": "Qui voluptatibus placeat ipsa alias quasi. Deleniti rem ut sint. Optio velit qui distinctio.",
+  "work_in_progress": false,
   "state": "reopened",
   "created_at": "2015-02-02T19:49:39.159Z",
   "updated_at": "2015-02-02T20:08:49.959Z",

lib/api/entities.rb

@@ -171,6 +171,7 @@ module API
       expose :source_project_id, :target_project_id
       expose :label_names, as: :labels
       expose :description
+      expose :work_in_progress?, as: :work_in_progress
       expose :milestone, using: Entities::Milestone
     end