1. js/*
	- the pdf.js for parse pdf file
	- the viewer template from pdf.js project
2. _posts/2014-05-21-How-To-Use-PDF.js-with-jekyll.md
	- Blog of how to use pdf.js
3. pdf_posts/*
	- the really blog in pdf-format
	- *.lyx was the lyx file from which the pdf was generated