Update to allow merge.
Merge branch 'point-context' of https://github.com/PDAL/PDAL into point-context

Conflicts:
	include/pdal/drivers/las/Reader.hpp
	include/pdal/drivers/nitf/Reader.hpp
	include/pdal/filters/Stats.hpp
	src/drivers/nitf/Reader.cpp
	src/filters/Stats.cpp
	src/kernel/Info.cpp
New metadata implementation.
Fix findVlr.  Add vlr metadata test.
Remove PointContext argument from initialize()