Updated for AR.Drone interactions
- We received (x,y) location of AR.Drone from Vicon motion capture
- Pheromones added on command from AR.Drone, placed at it's current (x,y) location
- AR.Drone pheromone is added with pheromone of FLT_MAX to avoid evaporation
- Display code updated to handle larger pheromone values, normalizes to (0,1) interval for displaying purposes