I am trying to integrate offline editor, so I installed my own stackedit server: http://markdown.medialog.no/editor#
It has some plugins to export to
Blogger, Dropbox, Gist, GitHub, Google Drive, SSH server, Tumblr, WordPress
So I am wondering how difficult it would be to make a plone plugin, if someone (that know javascript better than me) could looke at https://github.com/espenmn/stackedit/tree/master/public/res/helpers and point me in the right direction.