Add Ember 1.0 support.

* jQuery 1.10.2 needs valid JSON when responding `'{}'` vs. `''`.
* jQUery 1.10.2 removed `Deferred#isResolved`
* Ember 1.0 does not notify volatile properties when dependencies
  change.
* Ember 1.0's `sendEvent` takes an array of parameters, instead of an
  arbitrary number of arguments.