-Implemented pcl_ros passthrough nodelet from http://wiki.ros.org/pcl_ros/Tutorials/PassThrough%20filtering.
-Min and max z values configurable through the nodelet's launch file lidar_z_threshold.launch.
-Included the nodelet's launch file in mapping_sim.launch.
-Implemented pcl_ros passthrough nodelet from http://wiki.ros.org/pcl_ros/Tutorials/PassThrough%20filtering. -Min and max z values configurable through the nodelet's launch file lidar_z_threshold.launch. -Included the nodelet's launch file in mapping_sim.launch.
Example thresholding can be found here.
Resolves #357.