Implement constructor in car class, test file
Working car class with test file
Complete initialize method for used car class, new file to test used car class
Fixed logical error in car.rb
Finished Damage class
Finished used car class and test methods
Complete initialize method in CarLot class, test file set up
Complete lot value method in CarLot class
 * Fixed error with no damages set for calculating depreciation of used cars
Complete base specifications
Allow ability for cars to be sold
Done with extra challenge 1
Donezo! Might sexy it up in the morning.  Cars have unique id's
Tightened up find_by methods in car_lot class, changed id indexing to start at 1