Merge pull request #1452 from rjackson/update_ember-dev

Update `ember-dev` to (b0b12c4).
Generate static site tests.

This will publish a ember-tests.html static test site along with the
builds. This makes it extremely simple to test the latest
canary/beta/release builds on various devices. It is also critical to
the cross-browser testing that we have been working on.