Return version numbers of updates

services/track-changes/app/coffee/HttpController.coffee

@@ -42,6 +42,7 @@ module.exports = HttpController =
 			formattedUpdates = for update in updates
 				{
 					meta: update.meta
+					v: update.v
 				}
 			res.send JSON.stringify updates: formattedUpdates
 

services/track-changes/test/acceptance/coffee/GettingUpdatesTests.coffee

@@ -50,9 +50,11 @@ describe "Getting updates", ->
 				start_ts: @to
 				end_ts: @to
 				user_id: @user_id
+			v: 5
 		}, {
 			meta:
 				start_ts: @to - 2 * @minutes
 				end_ts: @to - 2 * @minutes
 				user_id: @user_id
+			v: 4
 		}]

services/track-changes/test/unit/coffee/HttpController/HttpControllerTests.coffee

@@ -90,5 +90,6 @@ describe "HttpController", ->
 			updates = for update in @rawUpdates
 				{
 					meta: @meta
+					v:    @v
 				}
 			@res.send.calledWith(JSON.stringify(updates: updates)).should.equal true