Refactor linewidth
WIP:Contour Widget
ENH: Contour Widget
ENH: Free Slice tool
Allow control points in one direction. Draw histogram
Merge branch 'ContourWidget'

Conflicts:
	ExampleVTKReader.cpp
	ExampleVTKReader.h
Merge remote-tracking branch 'origin/FreeSliceWidget'

Conflicts:
	ExampleVTKReader.cpp
	ExampleVTKReader.h