Added Open Graph Headers. Fixed 326, ExceptionalIO and others.

Added Open Graph Headers. Fixed 326, ExceptionalIO and others.

Fixes:
- Fix326 CleanCode: Seadragon CDN has been retired
- ExceptionalIO: Prevent canvas without HTML5 Canvas support (using modernizr) from loading.
- ExceptionalIO: Stop tracking exceptions in non-production environments

Features:
- Added support for Open Graph headers (title, images)

Minor:
- Server: Added missing optional web.config paremeters
- JavaScript: Removed RegimesIE.JS since refimes were reimplemented and are working in IE9 and IE10 without this workaround.
- JavaScript: Changed JQuery includes to use JQuery from CDN
- JavaScript: Consolidated ChronoZoom JS files into single cz.js file
- Analytics: Set domain to "auto" in analytics tracking code for fallback page.