[vtkusers] possible bug implicit + sampleFunction + contourFilter

[Justin Weber]

I am creating an implicit surface with vtkSphere, sampling with
vtkSampleFunction, and finally contouring with vtkContourFilter. This all
works fine.

*The Problem*: If I go back and update the sample dimensions, I don't get
what I would expect. If I double the sample dimensions, the extents seem to
be cut in half. Am I not updating/clearing data correctly? See the sample
images below:

a) sampleDimensions(10, 10, 10)
b) sampleDimensions(20, 20, 20)
a)    b)
​
Attached is a complete example.

environment:
python 2.7
vtk 6.3.0 (installed via anaconda)
Ubuntu

Justin
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