Updates to support HTML5 and Schema.org Microdata, and some jpeg viewer changes

HTML5
- Switched doctype to HTML5 (from XHTML transitional)
- Added html5shiv library for < IE9
- Implemented header, nav, and footer tags appropriately in item viewers
Microdata
- Added Microdata tags to item viewer, jpeg viewer, and citation viewer
Citation Viewer
- Added thumbnail which is actually the first complete page when pages exist, otherwise main thumbnail
- Added thesis and dissertation section
- Added ID's to all citation rows to be able to hide them
- Switched from table view to dl/dd/dt format for better semantic web support
- Increased width of citation view
JPEG Viewer
- Corrected JPEG image detection on whether a Zoomable version exists
- When zoomable exists, hover over says to click for zoomable