Add user guidance for OpenDocument attachments

https://www.pivotaltracker.com/story/show/72066166

  As a user looking at a publication with an attached document published in an OpenDocument format (ODS, ODP, ODT) I want to know what the document is and what software exists to allow to me view/edit it. 
This wasn't a pattern i've seen in the other attachment models, but added + rebased.