Import a real LRU implementation
Import a real LRU implementation

https://github.com/starius/lua-lru

NiLuJe/koreader-base,Frenzie/koreader-base,koreader/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,koreader/koreader-base,Frenzie/koreader-base,koreader/koreader-base