Update vagrant config.
Merge upstream and fix conflict.
Merge pull request #396 from connormanning/vagrantUpdate

Update vagrant config.
rework the MSVC version logic slightly, add possibility of VC2012/2013 to pdal_defines
Merge pull request #398 from chambbj/issues/397-msvc-version-handling

rework the MSVC version logic slightly, add possibility of VC2012/2013 to pdal_defines

Closes #397
don't chop off classification bits #403
update the pcl documentation to include ground filtering example and explanation of parameters
Merge pull request #404 from chambbj/pcl-doc-update

update the pcl documentation to include ground filtering example and explanation of parameters
add autzen-thin-srs to add srs info
Fix Fetchpcid bug

When there are more than one records in pointcloud_formats, fetchpcid( ) only return the first one.
Merge pull request #408 from cuitingting01/patch-1

Fix Fetchpcid bug