move
start
setup testing
flight paths spike
move connections out of Flight

It is a concern of the set -- flights should not persist what they
connect to.
move calculating paths out of Flight

This is not a model concern.
Flight is just a Struct
extract method
add FlightPath
flight data parsing
extract Flight
extract flight path
total price and flight time for FlightPath
Merge remote-tracking branch 'ohtwo/master'
move