Sorting by estimatedWait

Rather than sorting by parsing scheduledTime into a Java date, which
doesn't work because you only get HH:mm data (so it's tricky to work out
when 00:05 corresponds to today or tomorrow), instead use estimatedWait,
which gives a number of minutes until a train is due.
Filtering out min and mins from estimatedWait
Merge pull request #2 from sh1989/time_sort

Time sorting is incorrect