feat(dart/transformer:: Initial commit of ctor stubs & annotation register

Closes #646

Closes #496

Closes #498

modules/angular2/test/transform/simple_annotation_files/bar.dart

@@ -0,0 +1,8 @@
+library bar;
+
+import 'package:angular2/src/core/annotations/annotations.dart';
+
+@Directive(context: 'soup')
+class Component {
+  Component();
+}

modules/angular2/test/transform/simple_annotation_files/expected/index.bootstrap.dart

@@ -0,0 +1,14 @@
+import 'package:angular2/src/reflection/reflection.dart' show reflector;
+import 'bar.dart' as i0;
+import 'package:angular2/src/core/annotations/annotations.dart' as i1;
+import 'index.dart' as i2;
+
+main() {
+  reflector
+    ..registerType(i0.Component, {
+      "factory": () => new i0.Component(),
+      "parameters": const [const []],
+      "annotations": const [const i1.Directive(context: 'soup')]
+    });
+  i2.main();
+}

modules/angular2/test/transform/simple_annotation_files/index.dart

@@ -0,0 +1,7 @@
+library web_foo;
+
+import 'bar.dart';
+
+void main() {
+  new Component('Things');
+}