Initial commit. Random origins and destination. Intersection chooses
next intersection version.
Peachtree now computes a vehicle's complete route.
Implemented randomly choosing destination based on origin's destination
probability. Origin's have different interarrival rates. Haven't changed
the createArrivals method yet.
Changed arrival logic. Now creates arrivals using origin rates from
input files and randomly chooses destination based on an origin's
destination probability distribution.
Changed static methods in Peachtree.java. Class now uses a singleton
Peachtree instantiation.
Merge https://github.com/hwilliams11/TrafficSimulation