Package up for the rails asset pipeline.

We're using this for some of our apps at work and wanted it packaged up as a ruby gem.
I'm not sure if you want to add another package format to your project but thought it might be interesting.

Cheers
I understand that this is here to satisfy the default path structure for Rails engines, but doesn't the wiring in `lib/ember-i18n.rb` add the right path anyway?