ComponentSelector

The ItkSmoothingRecursiveGaussianImageFilterComponent is templated over
the dimensionality and pixeltype of in- and output. Stings "Dimensionality" and
"PixelType" are added as Criteria to select the right Component.

TODO: Superclass GetOutput() does not trigger Update() as it should

Blueprint::ParameterMapType

As of this commit the transformix filter executes correctly on
call to GetOutput(), but calling GetOutput on the elastix filter
does not trigger an Update() as it should

Unit tests failed because Ctest resets the testing environment whereas this is not the case when running elxCompomentFactory executable (or in Debug mode)