Work for 1.9.0-alpha.

* Update to barber (from https://github.com/tchak/barber/pull/29)
* Use mega-hacks to add the `formForModelPath` to child keywords (inside `{{form-for}}`).
* Update to use `view._keywords` and `view.getStream` to deal with new streams refactoring.

These changes will only work on canary builds of Ember (1.9.0-alpha and newer), so Travis will fail (because it runs against stable and beta also).

I am unsure if we should merge this, but I needed to understand how to make it function so figured it made sense to PR.  Feel free to close (unmerged)...