Comment 12 for bug 791225

I didn't like the actual solution in the branch offered. These files should either be supplied by the system admin or touch-created during build time, but they shouldn't exist as actual files in the repository that can trample over some site's customizations.

However, there are multiple solutions listed in this the ticket. I don't have any beef with the customcsscheck.sh script (just the create_custom_css branch), though it should probably be re-purposed as Dan suggested.