changed random weather numbers and tests so that it is sunny more often than not (previously 50/50 chance)
written tests for grand finale and seems to work. Now do sanity check
clarified capacity issue for the grand finale. All planes must land, and then all planes must take off. Therefore, hardcoded capacity has been changed from 5 to 6
Wrote new tests and fixed code where airport capacity was affected even when a plane couldn't take off/land. Also commented and cleaned up code.
Further refactoring done. Addedd successful_take_off successful_landing and stormy_weather methods to airport.rb