add a repl utility to horus.core to make server restarts faster
add fields for the signup form, and style them

  - add the CSRF middleware for ring, although for signup it's arguably
    not needed
handle 3rd-party assets more nicely

  - default to CDN mode, so we don't have to worry about running bower
    on travis or heroku for now
  - use a CDN for bootswatch instead of pullingit from bootswatch.com
    like a big jerk
  - use lein-bower plugin to pull down bootswatch for local development