Merge pull request matplotlib#3222 from WeatherGod/mplot3d/py3k_fixes

add reduce to the list of imports from six.moves

Author: tacaswell

Diff for: lib/mpl_toolkits/mplot3d/axes3d.py

@@ -14,7 +14,7 @@
 import math
 
 import six
-from six.moves import map, xrange, zip
+from six.moves import map, xrange, zip, reduce
 
 import warnings
 from operator import itemgetter