Allow automatic "waiting" in tests.
Allow automatic "waiting" in tests.

This has been fundamentally supported when using $.ajax based
requests for quite some time (since at least Ember 1.8ish).

This change brings testing parity to ember-fetch...
stefanpenner/ember-fetch,nlfurniss/ember-fetch,nlfurniss/ember-fetch,nlfurniss/ember-fetch,stefanpenner/ember-fetch,stefanpenner/ember-fetch,nlfurniss/ember-fetch