FIX: import reduce for python3

reduce is not available in the base language in python 3. I used a similar import as in nibabel.affines

Author: MichielCottaar

nibabel/cifti2/cifti2.py

@@ -24,6 +24,7 @@
 from .. import xmlutils as xml
 from ..externals import inflection
 from ..externals.six import string_types
+from ..externals.six.moves import reduce
 from ..filebasedimages import FileBasedHeader, FileBasedImage
 from ..nifti2 import Nifti2Image
 

nibabel/cifti2/parse_cifti2_fast.py

@@ -22,6 +22,7 @@
 from .. import xmlutils as xml
 from ..externals import inflection
 from ..externals.six import BytesIO
+from ..externals.six.moves import reduce
 from ..nifti1 import Nifti1Extension, extension_codes, intent_codes
 from ..nifti2 import Nifti2Header, Nifti2Image