pull base changes: fix for <code> elements in epubs
pull base changes: fix for <code> elements in epubs

needs https://github.com/koreader/koreader-base/pull/284
fixes #1222

pazos/koreader,NickSavage/koreader,Frenzie/koreader,lgeek/koreader,houqp/koreader,robert00s/koreader,noname007/koreader,mihailim/koreader,Frenzie/koreader,ashhher3/koreader,frankyifei/koreader,ashang/koreader,mwoz123/koreader,NiLuJe/koreader,Markismus/koreader,NiLuJe/koreader,chihyang/koreader,Hzj-jie/koreader,chrox/koreader,poire-z/koreader,koreader/koreader,apletnev/koreader,koreader/koreader,poire-z/koreader