[ImgBot] Optimize images

*Total -- 654.59kb -> 644.18kb (1.59%)

/img/lock.png -- 5.12kb -> 2.76kb (46.08%)
/img/nicktest.png -- 2.39kb -> 1.64kb (31.14%)
/img/TeamAvatar_Test.png -- 27.31kb -> 26.09kb (4.49%)
/img/emoticons/Azure_4.png -- 13.32kb -> 12.93kb (2.97%)
/img/emoticons/Azure_2.png -- 13.54kb -> 13.14kb (2.96%)
/img/emoticons/Azure_1.png -- 13.68kb -> 13.29kb (2.89%)
/img/emoticons/Azure_3.png -- 13.84kb -> 13.44kb (2.89%)
/img/emoticons/Vivian_2.png -- 15.21kb -> 14.81kb (2.65%)
/img/emoticons/Vivian_1.png -- 15.34kb -> 14.95kb (2.59%)
/img/emoticons/Vivian_3.png -- 15.48kb -> 15.08kb (2.58%)
/img/emoticons/Sanma_2.png -- 18.08kb -> 17.68kb (2.24%)
/img/emoticons/Sanma_1.png -- 17.97kb -> 17.57kb (2.21%)
/img/emoticons/Vivian_4.png -- 14.79kb -> 14.48kb (2.15%)
/img/emoticons/Sanma_3.png -- 17.03kb -> 16.67kb (2.08%)
/img/emoticons/Gothic_4.png -- 15.30kb -> 15.01kb (1.91%)
/img/emoticons/Gothic_3.png -- 15.01kb -> 14.72kb (1.89%)
/img/emoticons/Sanma_4.png -- 17.17kb -> 16.87kb (1.72%)
/img/emoticons/Gothic_2.png -- 15.67kb -> 15.41kb (1.69%)
/img/emoticons/Gothic_1.png -- 15.51kb -> 15.33kb (1.2%)
/img/n_64.gif -- 5.70kb -> 5.67kb (0.46%)
/img/n_24a.gif -- 16.86kb -> 16.78kb (0.46%)
/img/n_63.gif -- 6.95kb -> 6.92kb (0.38%)
/img/n_155a.gif -- 19.95kb -> 19.90kb (0.27%)
/img/n_152a.gif -- 16.91kb -> 16.87kb (0.25%)
/img/n_95a.gif -- 15.48kb -> 15.45kb (0.23%)
/img/n_36a.gif -- 21.83kb -> 21.78kb (0.23%)
/img/n_30a.gif -- 20.51kb -> 20.48kb (0.15%)
/img/n_34a.gif -- 21.82kb -> 21.79kb (0.13%)
/img/n_21a.gif -- 16.62kb -> 16.61kb (0.09%)
/img/n_69a.gif -- 24.37kb -> 24.35kb (0.09%)
/img/n_127a.gif -- 20.76kb -> 20.75kb (0.08%)
/img/n_153a.gif -- 21.93kb -> 21.92kb (0.07%)
/img/n_154a.gif -- 20.47kb -> 20.46kb (0.06%)
/img/n_38a.gif -- 20.77kb -> 20.76kb (0.05%)
/img/n_82a.gif -- 18.77kb -> 18.76kb (0.05%)
/img/n_22a.gif -- 18.40kb -> 18.39kb (0.04%)
/img/n_156a.gif -- 21.19kb -> 21.18kb (0.04%)
/img/n_35a.gif -- 20.13kb -> 20.12kb (0.04%)
/img/n_70a.gif -- 23.39kb -> 23.38kb (0.02%)
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