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Report precent difference when using a tolerance #149
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When using a tolerance, report the % difference to the console on failure + add a key to the NSError with the percent.
I had to refactor the
UIImage
categories to separate out the part where we calculate the percent difference. As-written it might be a little faster if the images are the same when using a tolerance, because it tries to domemcmp
before it calculates the percent.Fixes #109