The `activate` hook is not always called when the route is used,
specifically it will not be called when the model changes, but the
change happened within the same route (for example when switching from
/travis-ci/travis-web to /travis-ci/travis-core). `beforeModel` is
guaranteed to be called every time the model is changed, both when the
route is entered for the first time and on any subsequent calls.
We sometimes miss pusher updates, which started to be more common
lately. Until we investigate what's going on, this should be a good
workaround for keeping UI in sync with the DB.
