Consider changing catalog URL structure to be more logical

I think having /subjects/ANAT and /courses/ANAT_101 is kind of silly. Maybe something like /catalog/ANAT and /catalog/ANAT/101 would be better? The you could expand to sections as well, like /catalog/ANAT/101/Lec-1931 or something.

The only reason I haven't done this yet is because I don't know how it will effect Google's indexing of the site. Perhaps if the old pages return a 301 "permanently moved" redirect, it'll help with that. There's a simple guide [here](http://googlewebmastercentral.blogspot.ca/2012/04/how-to-move-your-content-to-new.html) about moving content. I'll probably follow something like that. Reminds me that I should submit a sitemap some day... Maybe after this.