Upgrade jQueryUI

What? Why are we upgrading jQueryUI? I thought we wanted to get rid of it? Well, sure, but in the mean time this buys us a few things

* We are using a newer version, which has to count for something.
* Now the contents of the primary jQueryUI bundle is documented, so working with it in the future will be better.
* I was having some huge problems with datepickers in bug 823891, and this makes it work nicely.
* jQueryUI is now using unminified files, which is good because it makes debugging easier and prod will still minify everything.

I didn't want to include this in the PR for bug 823891, because it is big, and reviewing big PRs is now fun.

I looked around the site for any place that uses a "jqueryui" bundle, and made sure major pages in those areas weren't throwing errors. The search page still has badly styled datepickers, but I looked into that and it is more work to fix than I want to do (if I fix the datepickers, it breaks the rest of the site).

r?