Pass test suite.

* Add `travis.source_endpoint` meta (fixes many tests with hard expectations on `http://github.com` being in URL paths).
* Wrap `Ember.run.once` in a `Ember.run` (prevents test auto-run assertion).
* Fix expect counts for a couple tests.
Without this change, an auto-run assertion is made during testing (because `Ember.run.once` adds an item to the queues, but no run-loop is active).