feat(router): add support for hash-based location

Closes #2555

modules/angular2/router.ts

@@ -12,6 +12,7 @@ export {RouterLink} from './src/router/router_link';
 export {RouteParams} from './src/router/instruction';
 export {RouteRegistry} from './src/router/route_registry';
 export {LocationStrategy} from './src/router/location_strategy';
+export {HashLocationStrategy} from './src/router/hash_location_strategy';
 export {HTML5LocationStrategy} from './src/router/html5_location_strategy';
 export {Location, appBaseHrefToken} from './src/router/location';
 export {Pipeline} from './src/router/pipeline';