Fix #76 - Change message to user to "No arrivals in the next 35 minutes"

when no arrivals are returned by the REST API.  35 minutes is the
arrivals-and-departures-for-stop REST API default value for minutesAfter
(see
http://developer.onebusaway.org/modules/onebusaway-application-modules/current/api/where/methods/arrivals-and-departures-for-stop.html).