[TIP] Show TiP: pdiffer - Call PerceptualDiff from Python

[Zachary Voase]

https://pypi.python.org/pypi/pdiffer

I needed to call out to PerceptualDiff from some Python unit tests, so 
rather than invoking subprocess every time, I wrapped it up in this 
library. It includes 'assert_images_similar' and 
'assert_images_different' functions, too.

Enjoy!
-- Z
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