Started working on fixing issue #15, and discovered that I've exceeded FIDS API usage limit. Added some tests a la issue #9 so Ada knows what to say when we can't get arrival and departure data
Tweaked the algo in updateAirports() that takes an airport name as input from TomTom and returns its IATA identifier. Per issue #8, the new code deals with Chicago Midway and Chicago O'Hare quite nicely. This loosely relates to Issue #16, since having things in the right order means that Ada reads them in the right order.