Pre-commit hook to ensure pngcrush has been used on every png

I work on web sites, and I want to make sure that any png file I
commit takes as little disk space possible. When I think about it, I
run pngcrush on each png before committing, but I often forget. So
today I wrote a pre-commit hook to enforce that every png must be
crushed. Here it is, in case this is useful to others.

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