added config option for custom public dir

config/config.example.yml

@@ -480,9 +480,14 @@ organization: CAS
 # if you prefer to have no extra text shown at the bottom of the login box.
 infoline: Powered by <a href="http://code.google.com/p/rubycas-server/">RubyCAS-Server</a>
 
-# Custom views file.  Overrides methodes in lib/casserver/views.rb
+# Custom views directory. If set, this will be used instead of 'lib/casserver/views'.
 #custom_views: /path/to/custom/views
 
+# Custom public directory. If set, static content (css, etc.) will be served from here rather 
+# than from rubycas-server's internal 'public' directory (but be mindful of any overriding 
+# settings you may have in your web server's config).
+#public_dir: /path/to/custom/public
+
 ##### LOCALIZATION (L10N) #######################################################
 # The server will attempt to detect the user's locale and show text in the 
 # appropriate language based on:

lib/casserver/server.rb

@@ -14,7 +14,7 @@ module CASServer
     include Localization
 
     set :app_file, __FILE__
-    set :public, Proc.new { File.join(root, "..", "..", "public") }
+    set :public, Proc.new { settings.config[:public_dir] || File.join(root, "..", "..", "public") }
 
     config = HashWithIndifferentAccess.new(
       :maximum_unused_login_ticket_lifetime => 5.minutes,