[Timeline] Watch for configuration object

...to address #908 in a manner which does not cause #957

platform/features/timeline/src/controllers/TimelineController.js

@@ -97,6 +97,8 @@ define(
                 }
             }
 
+            $scope.$watch("configuration", swimlanePopulator.configure);
+
             // Recalculate swimlane state on changes
             $scope.$watch("domainObject", swimlanePopulator.populate);