Use CSS and JS aggregation for local copies of YUI library

I was trying to figure out why my site started crawling after enabling the YUI Editor. The short version was that I hadn't specified a list of paths where the editor is used so all the CSS and JS was being included on every page in a way that bypassed the CSS and JS aggregation features. I can understand sending separate files when they're not hosted locally but it's totally crazy if they're on the same site.

Attached is a minimal patch to enable aggregation of the CSS and JS files.