matplotlib Code

testing: collect new image results on failed image comparisons

testing: implement image_comparison decorator

testing: give more informative error when nose plugin not installed

testing: clip abs diff image

testing: convert function names to MPL coding standard

testing: initial spine test (test for SF#2852168)

testing: add new, simplified testing infrastructure

testing: move image comparison functions into matplotlib.testing

testing: workaround issue with nose testing's ZeroNinePlugin

testing: install KnownFailure nose plugin if using setuptools