feat(transformers): added support for lifecycle events

modules/angular2/test/transform/directive_metadata_extractor/all_tests.dart

@@ -78,6 +78,16 @@ void allTests() {
       expect(metadata.hostListeners['keyDown']).toEqual('onKeyDown(\$event)');
     });
 
+    it('should parse lifecycle events.', () async {
+      var metadata = await readMetadata('directive_metadata_extractor/'
+          'directive_metadata_files/lifecycle.ng_deps.dart');
+      expect(metadata.callOnDestroy).toBe(true);
+      expect(metadata.callOnChange).toBe(true);
+      expect(metadata.callOnCheck).toBe(true);
+      expect(metadata.callOnInit).toBe(true);
+      expect(metadata.callOnAllChangesDone).toBe(true);
+    });
+
     it('should fail when a class is annotated with multiple Directives.',
         () async {
       var ngDeps = await parser.parse(new AssetId('a',

modules/angular2/test/transform/directive_metadata_extractor/directive_metadata_files/lifecycle.ng_deps.dart

@@ -0,0 +1,19 @@
+library examples.hello_world.index_common_dart.ng_deps.dart;
+
+import 'hello.dart';
+import 'package:angular2/angular2.dart'
+    show bootstrap, Component, Directive, View, NgElement, onChange, onDestroy, onInit, onCheck, onAllChangesDone;
+
+var _visited = false;
+void initReflector(reflector) {
+  if (_visited) return;
+  _visited = true;
+  reflector
+    ..registerType(HelloCmp, {
+      'factory': () => new HelloCmp(),
+      'parameters': const [const []],
+      'annotations': const [
+        const Component(lifecycle: [onChange, onDestroy, onInit, onCheck, onAllChangesDone])
+      ]
+    });
+}

modules/angular2/test/transform/integration/simple_annotation_files/expected/bar.ng_meta.json

@@ -10,6 +10,11 @@
     "properties": [],
     "readAttributes": [],
     "type": 1,
+    "callOnDestroy": false,
+    "callOnCheck": false,
+    "callOnInit": false,
+    "callOnChange": false,
+    "callOnAllChangesDone": false,
     "version": 1
   }
 }