facebook/ios-snapshot-test-case — pull request #30 by dblock (2014-03-25 02:46:24+00:00)
Title: You can no longer install this library by dropping in files.

The README is incorrect, you need the rest of the files, too, including things like UIImage+Compare and Diff. Either way I think using a library by copy-pasting code should be a thing of the past. It is probably silly to say "copy everything to make it work" in a README at this point.

Updated README to tell people to use CocoaPods.