build(typings): make router.d.ts depend on angular2.d.ts

if this is not done, DefinitelyTyped tests fail because of missing definitions for List, Map and other
apis that are part of router's public api

docs/typescript-definition-package/index.js

@@ -56,7 +56,7 @@ module.exports = new Package('angular-v2-docs', [jsdocPackage, nunjucksPackage,
       {
         id: 'angular2/router',
         namespace: 'ngRouter',
-        references: ['../es6-promise/es6-promise.d.ts'],
+        references: ['./angular2.d.ts'],
         modules: {
           'angular2/router': 'angular2/router'
         }