cleanup
Merge branch 'ead-dev-test' into ead-dev

Conflicts:
	src/main/scala/org/toxicblend/operations/offset2dshape/Offset2dShapeOperation.scala
	src/main/scala/org/toxicblend/typeconverters/Polygon2DConverter.scala
Made plane normal calculation much more numerically robust.
Ported code from http://missingbytes.blogspot.se/2012/06/fitting-plane-to-point-cloud.html