empty does not need to be guarded on windows
Merge pull request #595 from PDAL/option-empty

empty does not need to be guarded on windows
nitf plugin needs gitsha
Get spatial reference, rather than storing directly into metadata.
Merge branch 'master' of https://github.com/PDAL/PDAL
use PluginRegistry C API instead, as C++ symbols are not exported on windows
point to new location of Faux reader in OCITest
Merge branch 'master' of github.com:PDAL/PDAL
Merge pull request #596 from PDAL/register-tre-handler

use PluginRegistry C API instead, as C++ symbols are not exported on windows
Merge branch 'master' of https://github.com/PDAL/PDAL