[Insight-developers] More warnings

[Lorensen, William E (CRD)]

Please fix the following warning in your code.

cc-1174 CC: WARNING File = /home/lorensen/Insight/Testing/Code/Algorithms/itkGibbsTest.cxx, Line =
130
  The variable "ClassImageDimension" was declared but never referenced.

    unsigned int ClassImageDimension = NDIMENSION;
                 ^