Runloop guides are out of date

The guides for the runloop (version 3.4) are quite out of date. They refer to things that no longer exist, such as `Ember.run.queues` (there are still queues but they are no longer accessible on `Ember.run` and there is an embedded demo app here: https://s3.amazonaws.com/emberjs.com/run-loop-guide/index.html

That demo app uses an extremely old version of Ember (`1.3.2+pre.25108e91`).

Not sure what to do here, because it seems a sizable portion of the docs on the runloop are no longer applicable. Perhaps we should just remove the misleading information for now?