Bootstrap dashboard

@jvatic This is almost working, but I'm getting mixed content warnings. Please try it out locally and see how far you get. Also, please merge jvatic/static-sprockets#1.

@lmars Please review this when you have a minute.
I was thinking about that. I wonder if we should combine `DEFAULT_ROUTE_DOMAIN` and `CONTROLLER_DOMAIN`, as 100% of the time we set them to the same thing. I haven't thought through all of the implications yet, but it's worth considering.