ja/Ryubook.pdf: 0e15504 fix image sizes for epub and remove unnecessary attentions
ja/html: 0e15504 fix image sizes for epub and remove unnecessary attentions
ja/Ryubook.epub: 0e15504 fix image sizes for epub and remove unnecessary attentions
ja/Ryubook.mobi: 0e15504 fix image sizes for epub and remove unnecessary attentions