matplotlib/matplotlib — pull request #3642 by tacaswell (2014-10-13 18:55:17+00:00)
Title: TST : know-fail shadding tests

The underlying issues is the changes to np.gradient in numpy 1.9.0.
Known-fail these tests so that travis is still useful while we decide
how to fix these tests.

See discussion in #3598

attn @jenshnielsen