A PR to fix some bug when dealing with pdf file. header&footer ,missing information when splitting chapter,etc. #193
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1, add funtion to remove header and footer
2, fix bug of missing to deal with chapter which is the final keys of chapter list
3, update the replace method to replace some useless utf-8 char in some paper
4, fix bug of merging the text together when chapter is over 1 page
提交一些PR来修复pdf 处理中一些棘手的问题。这几个问题在理论性强一些的文献中比较重要。