Finished GTFS script

Added a few more fields. The script now runs for tomorrow and removes
any collection older than today.
Tweaked direction field in FTP processing

The direction in the FTP feed is 1 (outbound) or 2 (inbound). The
direction in the GTFS feed is 0 (outbound) or 1 (inbound). Going to
standarize on the GTFS.
Added READMEs for running scripts on Iron.io
Get Trip ID for checkins

While processing FTP feed, check the scheduled stop times to get the
trip that the bus is on. This trip id will be used to predict when a
the bus will get to a given stop in the future.