Stop showing already-departed buses
Stop showing already-departed buses

Fixes #864

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