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由 Xavier Noria 提交于
Revert "Compressed all images from the guide through ImageOptim which saves sometimes up to 74.6% in size [ci skip]" Reason: this change can't really be done in docrails, see http://weblog.rubyonrails.org/2012/3/7/what-is-docrails/ This reverts commit bc06e8d7.
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