cs215/finalexam/01_bipartite.py added
cs215/finalexam/02_feel_the_love.py added
cs215/finalexam/03_weighted_graph.py added
cs215/finalexam/04_best_flight.py added (incomplete)
cs215/finalexam/04_best_flight_my.py: fixed issue with multiple edges between nodes
cs215/finalexam/04_best_flight_my.py: more work; still broken
cs215/finalexam/04_best_flight_my.py: starting over from scratch
cs215/finalexam/04_best_flight_my.py: added make_flight_graph() function; needs more unit tests