Ran pngcrush on all png-images

Ran pngcrush on all png-images
Roughly 10% reduction overall

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    entries/2013_11_skittles/05_hues.png
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    entries/2014_05_lcov/sixth-attempt-thumb120w.png
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    entries/2014_08_whylinux/enterpass.ff.png
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    mailchimp.png
    swl_logo_sm_light.png