clean up a bunch of leaks
Initial implementation of the PCL Filter Block with sample pipelines, draft documentation, and representative unit tests. Vagrantfile is updated to also load and build PCL (required).
throw exceptions when random iterators are not found for filters.programmable and filters.predicate
fix up exception throwing to actually throw useful exceptions
use BOOST_CHECK_CLOSE so we can get some output when failures happen
beef up error detection in cases where Python array types don't match PDAL dimension types
make filters.mosaic work more better. Provide an example of a mosaic that creates new dimensions, filters data, and updates one leg of the filters.mosaic with Python
add missing data
resolve #243, missing PCD header
Merge pull request #244 from PDAL/issue/243-pcd-writer

resolve #243, missing PCD header
resolve #245, pdal translate recognizes PCD format by extension
Merge pull request #246 from PDAL/issue/245-pdal-translate

resolve #245, pdal translate recognizes PCD format by extension
Merge branch 'master' into feature/pcl-block
Merge pull request #247 from PDAL/feature/pcl-block

Feature/pcl block
back off the default VM requirements
adding test pipeline and pcl block for grid minimum
updating PCL-related documentation
move the PCL Block XML files to the filter folder, create subfolder for the JSON files, remove some deprecated PCL Block examples
improving PCLBlock filter for #248
Merge pull request #249 from PDAL/issue/248-pcl-block-improvements

improving PCLBlock filter for #248