Bubble the error to top if we don't handle it in Ember.Route
Bubble the error to top if we don't handle it in Ember.Route

A proper thing to do when an error is not handled is to bubble it up
rather than using throw (which we were using before this commit).

travis-ci/travis-web,mjlambert/travis-web,fotinakis/travis-web,fauxton/travis-web,travis-ci/travis-web,2947721120/travis-web,fauxton/travis-web,travis-ci/travis-web,Tiger66639/travis-web,2947721120/travis-web,Tiger66639/travis-web,fotinakis/travis-web,fotinakis/travis-web,fauxton/travis-web,jlrigau/travis-web,2947721120/travis-web,fotinakis/travis-web,Tiger66639/travis-web,Tiger66639/travis-web,travis-ci/travis-web,mjlambert/travis-web,mjlambert/travis-web,jlrigau/travis-web,jlrigau/travis-web,2947721120/travis-web,fauxton/travis-web,mjlambert/travis-web,jlrigau/travis-web