Raise a meaningful error message in @image_comparison decorator#5518

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maxalbert wants to merge 2 commits intomatplotlib:masterfrom

maxalbert:image_comparison_error_message

Commits on Nov 19, 2015

Raise a meaningful error message to make the use of the @image_comparison decorator more user-friendly for projects other than matplotlib.
maxalbert
committed
Change exception type back to AssertionError (in a somewhat shot-in-the-dark attempt to fix the Travis build with numpy 1.6).
maxalbert
committed