Injected the airport module dependency to the airspace's globals module.
Changed the port parameter for an options object parameter.
Exposed the first method of the runway module to request permission to fly.
Created separate functions to validate the supplied host and port parameters.
Added a call to airport#requestDeparture on calls to #fly.
Changed the port parameter for an options parameter in #createAirport.
Added an exception for wrong options in jsfly#fly(options).