Merge branch 'point-context' into point-context-schema

Conflicts:
	include/pdal/Stage.hpp
	src/Schema.cpp
	src/kernel/Info.cpp
Merge branch 'point-context-schema' of github.com:PDAL/PDAL into point-context-schema

Conflicts:
	include/pdal/Stage.hpp
	src/kernel/Info.cpp
useREST still exists, just not switched back on yet
Classification is Unsigned8, not 16