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.
Merge branch 'master' of https://github.com/PDAL/PDAL into iter

Conflicts:
	src/StageFactory.cpp
Fix bad merge.
Merge pull request #565 from PDAL/iter

Iter