Iterator test.
Merge branch 'master' of https://github.com/PDAL/PDAL into iter
More swap work.
Merge branch 'master' of https://github.com/PDAL/PDAL into iter
Working sort filter.
Merge branch 'master' of https://github.com/PDAL/PDAL into iter
Formatting.
Handle forwarded metadata regardless of case.
Merge branch 'master' of https://github.com/PDAL/PDAL into iter

Conflicts:
	src/StageFactory.cpp
Merge pull request #564 from PDAL/forward

Handle forwarded metadata regardless of case.
Fix bad merge.
Merge pull request #565 from PDAL/iter

Iter
Fix initialization order.
Use fewer threads for g++ to conserve memory.
add filters.attribute to stage list
Fix setting header system ID.
Merge branch 'master' into issues/562-laz-perf
basic PointBuffer->comp->decomp->PointBuffer working #562