old_contents: 
  from niftiimage import NiftiImage
  
new_contents: """
  Nifti
  =====
  
      Python bindings for the nifticlibs.  Access through the NiftiImage class.
  
      See help for pyniftiio.nifti.NiftiImage
  
  """
  
  from niftiimage import NiftiImage
  
subject: Add doc for pynifti package.