Added map of the jackal-race world and removed willowgarage map
Modified the Wheel separation multiplier to fix the difference between cmd_vel and odometry reading.
Modified costmap and base planner parameters for the navigation without map with obstacle avoidance using laser scanner.
Modified slam_gmapping parameters for Jackal for building a map.
Renamed map to jackal_race
Added rviz configuration files for navigation and mapping
fixed problems mentioned in the review.
Modified AMCL's parameters, map and demo for Jackal.
added author name. fixed some conflicts
added wheel separation multiplier (after fixing the conflict)