Record user id correctly when updating position

services/real-time/app/coffee/WebsocketController.coffee

@@ -127,7 +127,7 @@ module.exports = WebsocketController =
 						first_name: first_name,
 						last_name:  last_name,
 						email:      email,
-						user_id:    user_id
+						_id:        user_id
 					}, {
 						row:    cursorData.row,
 						column: cursorData.column,

services/real-time/test/unit/coffee/WebsocketControllerTests.coffee

@@ -331,7 +331,7 @@ describe 'WebsocketController', ->
 
 			it "should send the  cursor data to the connected user manager", (done)->
 				@ConnectedUsersManager.updateUserPosition.calledWith(@project_id, @client.id, {
-					user_id: @user_id,
+					_id: @user_id,
 					email: @email,
 					first_name: @first_name,
 					last_name: @last_name