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Solution in Go for the Instagram challenge "unshred this image"

Solution to the (fun!) Instagram engineering challenge posted at:

http://instagram-engineering.tumblr.com/post/12651721845/instagram-engineering-challenge-the-unshredder

Produce a script that reads in a shredded image (like the one below) and produces the original image. For this image, you can assume shreds are 32 pixels wide and uniformly spaced across the image horizontally. These shreds are scattered at random and if rearranged, will yield the original image.