Upgrades the pages that were using a locally bundled jQuery 1.6.4/1.7.2
to use 1.9.1 from the Google CDN. Also ran the jquery migration tool
against all pages to look for upgrade issues.
http://code.jquery.com/jquery-migrate-1.1.0.js
Replaces locally bundled json2 library with links to our CDN.
Replaces locally bundled jQuery bgiframe plugin with CDN links.