fix(modeling): make sure lanes get ids assigned

lib/features/modeling/BpmnFactory.js

@@ -18,6 +18,7 @@ BpmnFactory.prototype._needsId = function(element) {
          element.$instanceOf('bpmn:MessageFlow') ||
          element.$instanceOf('bpmn:Artifact') ||
          element.$instanceOf('bpmn:Participant') ||
+         element.$instanceOf('bpmn:Lane') ||
          element.$instanceOf('bpmn:Process') ||
          element.$instanceOf('bpmn:Collaboration') ||
          element.$instanceOf('bpmndi:BPMNShape') ||

test/spec/features/modeling/lanes/CreateLaneSpec.js

@@ -34,6 +34,9 @@ describe('features/modeling - create lanes', function() {
       var lane = laneShape.businessObject;
 
       // then
+      // expect it to have an id
+      expect(lane.id).to.exist;
+
       expect(laneShape).to.exist;
       expect(lane).to.exist;