Allow easier unit/integration testing from ember-cli.
Allow easier unit/integration testing from ember-cli.

This allows the normal resolver to find `transform:fragment` when using
`moduleForModel` either with `needs: [ 'transform:fragment' ]` or with
`integration: true`.

lytics/ember-data-model-fragments,jrhe/ember-data.model-fragments,HelloWallet/ember-data.model-fragments,jnetterf/ember-data.model-fragments,jkusa/ember-data.model-fragments,lytics/ember-data.model-fragments,greyhwndz/ember-data.model-fragments,lytics/ember-data-model-fragments,jackweinbender/ember-data.model-fragments