`Resolver['default']` is no longer needed, `Resolver` is already what we need.
OCD
extract ember-load-initializers and use that in app/app.js
Merge pull request #588 from ghedamat/mattia/test-initializers

extract load-initializers and use it in test-loader
locks ember-load-initializers to 0.0.1
Merge pull request #589 from fsmanuel/master

locks ember-load-initializers to 0.0.1