Clean up dead tests and linting console errors

Upgrade ember, ember-cli, and ember-engines

Restore default `configPath` setting.

Upgrade ember-cli 2.6.2.

Merge pull request #1 from dgeb/fix-config-path

Remove custom `configPath` setting for engine.

Add some boilerplate tests.

Use engine’s config/environment in test resolver.

Use engines-aware resolver in dummy app.

Upgrade ember-cli-quint ^2.0.2.

Add logging to show store injected into routes is a DS.Store

Import from 'ember-load-initializers'.

Upgrade ember-cli 2.5.1

Update to latest ember-engines#v0.2

Upgrade to ember 2.6.0.