refactor(router): move ROUTE_DATA token into own file

This change is to accomodate the router in Angular 1.x

modules/angular2/router.ts

@@ -22,6 +22,7 @@ export {CanActivate} from './src/router/lifecycle_annotations';
 export {Instruction, ComponentInstruction} from './src/router/instruction';
 export {Url} from './src/router/url_parser';
 export {OpaqueToken, Type} from 'angular2/angular2';
+export {ROUTE_DATA} from './src/router/route_data';
 
 import {LocationStrategy} from './src/router/location_strategy';
 import {HTML5LocationStrategy} from './src/router/html5_location_strategy';