BUG: Non-square images mesh not specified correctly

Test checks if the mesh is correctly connected

Measures the average surface area per cell

Change-Id: I57cfab90e87d9d578fe2ee16290797b9f5c3542c
Merge branch 'master' into LevelSetv4Visualization

Conflicts:
	Modules/Segmentation/LevelSetsv4Visualization/include/itkVTKVisualize2DLevelSetAsElevationMap.h
	Modules/Segmentation/LevelSetsv4Visualization/test/itkVTKVisualize2DLevelSetAsElevationMapTest.cxx

Change-Id: I16abdb35e4bd11e74e0bc5a9a3369cc817cc0c84
Merge topic 'LevelSetv4Visualization'

cd6d260 Merge branch 'master' into LevelSetv4Visualization
9ec414e BUG: Non-square images mesh not specified correctly