:Merge branch 'master' of https://github.com/PDAL/PDAL into issues-641

Conflicts:
	test/unit/CMakeLists.txt
	test/unit/PointBufferTest.cpp
Merge branch 'master' of https://github.com/PDAL/PDAL into issues-641
Don't pass base library unless necessary.
Merge branch 'issues-641' of https://github.com/PDAL/PDAL into issues-641

Conflicts:
	cmake/pdal_targets.cmake
	test/unit/CMakeLists.txt