GetVehicle display as SDL_Rect instead of x, y coordinates.
Rename makefile to Makefile so netbeans doesnt go all poopy.
common defines and constants for use amongst other header and implementation files.
Updated driver logic to slow down for car in front of him.
Merge branch 'master' of https://github.com/kevinthedestroyr/traffic

Conflicts:
	src/driver.cc

Added fields to driver constructor: road_ and slow_down_factor_