fixed the start and end tile ID variables being public to now being private
updated comments, cleaned up code, and updated README
added rendering for mobs, and towers + bullets
added utility timer to entity - implemented timer for movement for mob .. added rendering to game and screen for mobs and towers
added test mob... needs debugged
fixed movement bug with standardMovementSpeed
changed all floats to doubles
fixed rendering engine to correctly render the mob
improved mob movement so that the sprite image renders with the mob location at the center of the sprite ... fixed corners
fixed movement so that mobs aren't moving twice their speed, and properly take corners
changed rendering process to only render the appropriate size for a given mob
Attempted merge