chore(build): don't use global module format in router bundle

Empty ES6 files are detected as "global" module format by default which means that we end up with 2 module formats in a bundle (es6 and global). This makes module loading more complex and make break with certain SystemJS builder / loader combinations. Fixes angular#3528 Closes angular#3561

Author: pkozlowski-opensource

gulpfile.js

@@ -941,9 +941,12 @@ var bundleConfig = {
  meta: {
  // auto-detection fails to detect properly here - https://github.com/systemjs/builder/issues/123
  'rx': {
- format: 'cjs'
- }
+ format: 'cjs'
+ },
+ 'angular2/src/router/route_definition': {
+ format: 'es6'
  }
+ }
 };
 
 // production build