aeroplane that can takeoff and land created
ability to land dependent on weather conditions
take off and landing dependent on weather
random weather generator created
fixed random weather tests
airport created. Default of no planes
planes lanes land in airport
take off method added to airport.
airport  lets planes land and take off
raises error if airport is full and a plane tries to land
weather is now a module
fixed descibed_class error
weather is now random at airport
runs weather_rand method each time
fixed random number issue
final version