Marks alerts older than 24 hours as ‘read’ automatically
Marks alerts older than 24 hours as ‘read’ automatically

Fixes #1067 - Automatically mark all alerts that are older than 24 hours as read

OneBusAway/onebusaway-iphone,ualch9/onebusaway-iphone,cathy810218/onebusaway-iphone,cathy810218/onebusaway-iphone,OneBusAway/onebusaway-iphone,themonki/onebusaway-iphone,OneBusAway/onebusaway-iphone,OneBusAway/onebusaway-iphone,themonki/onebusaway-iphone,themonki/onebusaway-iphone,cathy810218/onebusaway-iphone,ualch9/onebusaway-iphone,ualch9/onebusaway-iphone,themonki/onebusaway-iphone,ualch9/onebusaway-iphone,ualch9/onebusaway-iphone,OneBusAway/onebusaway-iphone,themonki/onebusaway-iphone,cathy810218/onebusaway-iphone