epub reader on ios.
clone here: https://bitbucket.org/79144876/basicreaderforiphone support pdf,text and epub file. but not su bookmark fun. some idea: https://stackoverflow.com/questions/9987038/ios-how-to-implement-a-bookmark-for-epub-reader
https://github.com/fedefrappi/AePubReader/issues/5