bootstrap_customizer.views.CSSBelowTheFoldView
This view returns a CSS response containing the contents of the current site's BootstrapTheme.css_below_the_fold.
The view has a required hash keyword argument to uniquely identify it per-theme, obtained using BootstrapTheme.get_hash(). This allows the view to bust its cache when requesting the below-the-fold CSS for a different site, for instance.
The view is cached for CACHE_MIDDLEWARE_SECONDS seconds.
This view is most often referenced using the bootstrap_theme_css_below_the_fold_url template tag