The EngineInstance encapsulates all of the stateful aspects of a running Engine.

Initialize the Ember.EngineInstance and return a promise that resolves with the instance itself when the boot process is complete.

The primary task here is to run any registered instance initializers.

See the documentation on BootOptions for the options it takes.

Build a new Ember.EngineInstance that's a child of this instance.

Engines must be registered by name with their parent engine (or application).

Clone dependencies shared between an engine instance and its parent.

Unregister a factory.

Overrides RegistryProxy#unregister in order to clear any cached instances of the unregistered factory.

The base Engine for which this is an instance.