Avoid having to watch the user in route controllers at all by resolving
it as a prerequisite of the routes, much like the store bootstrap. The
user may still be ``null`` but it will not be ``undefined``.

For clarity, the $routeChangeStart handler is changed back to a
function, ``cleanupAnnotations``, that is called explicitly from
the user watcher in the ``AppController`` right before the route
reloads.