Render Previewed citations within break seperated divs.

Changes:
* Allow preview to persist, so refreshing the page doesn't destory the preview.
* Removed superfluous data for returning to the previous page, now using
   javascript.

OnTime Ticket: 1100
Identified Problem:
 Both RTF and PDF previews show multiple citations as one big chunk of text, not
 separate and in the correct citation format (NLM, APA, etc...)  Happens with
 all formats.