Reorg
Split out favourite stop input
Mend some code to work with stop_number as an int
Cleanup FavouriteStopArrayAdapter construction
Privatise show_for_date

It previously needed to be public because the previous implementations of
DatePickerFragment & TimePickerFragment directly modified show_for_date,
rather than use a callback based architecture as they do now.
Small cleanup
Get the favourite stop input working
Empty constructor for reconstruciton from bundle
Get that damn "Now" button working again