I've shared these with a handful of people, but in case it helps anyone else—here's how I deployed Ember to GH pages & Rails to Heroku:
First, watch out for three issues w/the Ember deployment guide:
git push heroku master
heroku run rake db:migrate
heroku run rake db:seed
heroku config:set SECRET_KEY_BASE=$(rake secret)
heroku config:set SECRET_TOKEN=$(rake secret)
heroku config:set CLIENT_ORIGIN=https://yourgithubname.github.io
heroku apps:rename newname
ENV.rootURL = '/quiltr';
ENV.apiHost = 'https://quiltr.herokuapp.com';
git checkout -b gh-pages
ember build --environment=production
git subtree push --prefix dist origin gh-pages
Please leave this open for now. Where these notes identify issues that should be addressed, they need to be filed in their appropriate repos.
If you'd like to talk about this issue with respect to your own deployment, please open another issue and reference this one.