added latex button
convert to pdf on heroku via latex and docverter
convert to pdf on heroku via latex ad latex-online https://github.com/aslushnikov/latex-online
convert to pdf on heroku via latex ad latex-online https://github.com/aslushnikov/latex-online
Merge branch 'master' of heroku.com:markx
indentation
avoid duplicate citation keys in bibtex
added default bib file for demo on heroku