This reverts commit ea84a82f77.
This is causing problems with `/theme-qunit` on legacy, non-ember-cli production sites. Reverting while we work on a fix
This is quite complex as it means that in production we have to build
Ember CLI test files and allow them to be used by our Rails application.
There is a fair bit of glue we can remove in the future once we move to
Ember CLI completely.
* DEV: Use Ember CLI middleware to decorate the index template
Previously we'd do this on the client side which did not support our
full plugin API. Now requests for the index template will contact the
dev server for a bootstrap.json and apply it to the current template.
* FIX: Allows logins in development mode for Ember CLI
Some plugins (like discourse-calendar) import things from `@ember/string` and `rsvp`, so we need to add them in order for the plugins to work with Ember CLI.
