chore(npm): publish artifacts to npm

Note that there are still a few pending tasks before this can land, namely getting permissions for all of the package names on npm:

* ~~[angular](https://www.npmjs.org/package/angular)~~ – got it. Thanks @bclinkinbeard!
* ~~[angular-animate](https://www.npmjs.org/package/angular-animate)~~ – got it. thanks @pitbeast!
* ~~[angular-cookies](https://www.npmjs.org/package/angular-cookies)~~ – got it. Thanks @petermelias!
* ~~[angular-mocks](https://www.npmjs.org/package/angular-mocks)~~ – got it. Thanks @zizzamia!
* ~~[angular-route](https://www.npmjs.org/package/angular-route)~~ – got it. Thanks @mljsimone!
* ~~[angular-resource](https://www.npmjs.org/package/angular-resource)~~ – got it. Thanks @roylines!
* ~~[angular-sanitize](https://www.npmjs.org/package/angular-sanitize)~~ – got it. Thanks @akalinovski!

If you own one of these packages, you can help by adding user "angularcore" to the package

### unclaimed: 
* angular-aria
* angular-i18n
* angular-loader
* angular-scenario
* angular-touch
* angular-messages

~~I also still need to add `package.json` for each `bower-angular-*` repo (since that's how we'll be publishing these artifacts).~~ done!

Closes #2877