feat(router): add router metadata

modules/angular2/src/alt_router/metadata/decorators.dart

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+library angular.alt_router.decorators;
+
+import 'metadata.dart';
+export 'metadata.dart';
+
+class Routes extends RoutesMetadata {
+  const Routes(List<RouteMetadata> routes): super(routes);
+}

modules/angular2/src/alt_router/metadata/decorators.ts

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+import {RoutesMetadata, RouteMetadata} from "./metadata";
+import {makeDecorator} from 'angular2/src/core/util/decorators';
+export interface RoutesFactory {
+  (routes: RouteMetadata[]): any;
+  new (routes: RouteMetadata[]): RoutesMetadata;
+}
+export var Routes: RoutesFactory = <RoutesFactory>makeDecorator(RoutesMetadata);

modules/angular2/src/alt_router/metadata/metadata.ts

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+import {CONST, Type, stringify} from "angular2/src/facade/lang";
+
+export abstract class RouteMetadata {
+  abstract get path(): string;
+  abstract get component(): Type;
+}
+
+@CONST()
+export class Route implements RouteMetadata {
+  path: string;
+  component: Type;
+  constructor({path, component}: {path?: string, component?: Type} = {}) {
+    this.path = path;
+    this.component = component;
+  }
+  toString(): string { return `@Route(${this.path}, ${stringify(this.component)})`; }
+}
+
+@CONST()
+export class RoutesMetadata {
+  constructor(public routes: RouteMetadata[]) {}
+  toString(): string { return `@Routes(${this.routes})`; }
+}