* Ignore calls to `/rails/mailers`. [#520] * Call `render` with `html:` instead of `text:`. [#519] * Use `Mime::Type.html?` [#523] [#520]: https://github.com/thoughtbot/ember-cli-rails/pull/520 [#519]: https://github.com/thoughtbot/ember-cli-rails/pull/519 [#523]: https://github.com/thoughtbot/ember-cli-rails/pull/523