Set Ember to stub the API by default in development, and Testem to do the same in tests. Created a script to run the backend in parallel with tests.
Simplified serve-dev script. We don't need to run the builder, since we can serve ember with ember-cli and pass requests on to the backend with the --proxy option (which I've specified in .ember-cli).
Fixed errors in test routes and test config for API.
Switched test configuration for API to use in-memory database. Way faster!
Set API tests to use the 'test' configuration in settings.js, instead of defining their own settings.
Fixed slow test on API (turns out I had accidentally put us back to rendering HTML error pages for API requests when I moved the API into its own router)