3340 Move JavaScript from head to improve performance

http://code.google.com/p/otwarchive/issues/detail?id=3340

* Moved most of the javascript out of the `<head>` and under the footer
* Left LiveValidation in `<head>` because it otherwise breaks and we're changing it soonish anyway
* Moved the yield for our page-specific javascript out of `<div id="footer">` and into the new javascripts partial because it needs to be loaded after jQuery

Updated:

* Removed the old scriptaculous.js file
* Removed the visualize.jQuery.js and visualize.jQuery.css files, which were originally for making graphs on the admin/stats page but which aren't being used
* Stopped including visualize.jQuery.js because it's not being used and has now been deleted
* Took out some ancient lines in application.js: lines 36-39 were for calling visualize.jQuery.js; lines 41-47 were for a very old version of the pseud switcher; lines 246-250 were also for the very old version of the pseud switcher; lines 312-318 were for a very old version of the admin notification page