Reworked the default WSGI theme.

It's getting better. Definitely more mobile friendly.

In the course of reworking the theme, I also fixed various bugs I ran
across and I made the cache do the modified polling updates I mentioned
before.
Made clean-up cleanup since cleanup is word.
Switched theme back to using ids

Using titles would mean no way to link to titleless assets.
WSGI app can edit asset tags now.