Bump version number to 0.3.2.
Bump version number to 0.3.2.

The most important changes since 0.3.1 are:
- the addition of niftitodicom, a NIFTI to DICOM converter
- a fix to vtkNIFTIWriter where off-axis qforms could be inverted

dgobbi/vtk-dicom,hendradarwin/vtk-dicom,dgobbi/vtk-dicom,hendradarwin/vtk-dicom,hendradarwin/vtk-dicom,dgobbi/vtk-dicom