Revert "[fixes #1571] Prevent simulated events from causing nested run-loops."

This reverts commit a931b9db05dff7f9afee319ccec642203c8b5935.

See:
https://github.com/emberjs/ember.js/commit/a931b9db05dff7f9afee319ccec642203c8b5935#commitcomment-3291185

Conflicts:
	packages/ember-views/lib/system/event_dispatcher.js