Fixes #103

Yes @pgleeson it has to do with the 'export as' function still under
development
Merge branch 'master' into release7
Centralized parsing function for getting md and txt files from repos
(parse_repo_links) and osb parsing, such as osbDoc, pubmed...
(parse_osb_links)
First iteration for #78: parsing pubmed
  TODO: 
  - [] Popup with some info 
  - [] Enhance bibliography styles
  - [] Link to other projects referencing this pub
Added nokogiri bundle for parsing html,css,xml...