Render Previewed citations within break seperated divs.

 * 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.
Merge pull request #24 from nigelgbanks/7.x-preview-display-issues

Render Previewed citations within break seperated divs.