Added ability for user to define minimum and maximum return thresholds.  Values returned outside these thresholds will be discarded.

Fixed an issue where the rotation angle returned from the HDL might be 36000 (instead of 0).  This causes a buffer access overflow.
fix
Merge pull request #29 from bouffa/master

fix a bug in pcl::copyPointCloud
Merge pull request #20 from KevenRing/master

Min/Max Value Threshold for sensor.  This also addresses an issue with azimuth angles from the sensor.
fixing several doxygen errors & adjusting octree to pcl programming style guide
fixing compiler warning
fixed compilation error on GCC 4.7.2
added a fix to deal with oscillations in SAC-based model refinement
fixing octree unit test
improved the SAC model refinement and fixed a bug where if the number of
inliers refined would go to 0, the original number of inliers would be
overwritten