second attempt after rollback of https://github.com/angular/angular/pull/2946
After each successful build in the dart stable variant, this uploads just enough of the dart
artifacts to mirror what we would push to pub.
By uploading the files instead of a zip, this lets dart users depend on an unreleased snapshot
of angular2, and lets us easily fetch the dart artifacts for sync into google3
without having to re-build (potentially in a subtly different environment).
This doesn't upload anything for pull requests.
Performed a slight refactoring of CI scripts to make it easier for
developers to run the **same** tests as those run on Travis. Defined
`npm` scripts `test-js` and `test-dart`. `npm test` now runs the whole
lot.
Closes#966
Marc Laval
Yegor Jbanov
Alex Eagle
Patrice Chalin