This produces a file like the following:
<%#
# Stylesheet Partial
This partial imports the necessary stylesheets on each page.
By default, it includes the application CSS,
but each page can define additional CSS sources
by providing a `content_for(:stylesheet)` block.
%>
<% Administrate::Engine.stylesheets.each do |css_path| %>
<%= stylesheet_link_tag css_path %>
<% end %>
<%= yield :stylesheet %>
In app/views/admin/application/_stylesheet.html.erb
. Fixes #888 (closed).