Properly propagate range_cutoff

LaserProjection::transformLaserScanToPointCloud_ did not
pass the range_cutoff parameter to projectLaser_.
Treat max_range as invalid measurement

The stage simulator and the legacy projectLaser_ method
for sensor_msgs::PointCloud treat the max_range/range_cutoff
value as invalid, and so should the projector for
sensors_msgs::PointCloud2.
Merge pull request #5 from fkie/fix-pointcloud2-projection

Fix pointcloud2 projections