Don't bind to ipv6 localhost (workaround for very slow requests).
Listen on $routeUpdate on the current $scope instead of the $rootScope, so
the listener gets destroyed when the scope is destroyed. What happened
before was that each time one of these controllers were created, a new
listener was created, and never destroyed. This could for example caused
the page title to be buggy, because a stale listener for the ReadTextsCtrl
was setting the title when the ReadConfTextsCtrl was active.