Fix Search

This fixes the search feature, which is powered by
TipueSearch:
http://www.tipue.com/search/

The important part of this commit is that the
tipuesearch_content.erb script is now outputting
valid JSON. Before, it had errantly picked up the
search page and tried to add its javascript to the
JSON object.

Other changes:

* Update the app to use the latest jQuery from
  Google's CDN
* Update the TipueSearch lib to the latest version
* Move the site's JS to its head -- no need for
  page-specific JS