set url root

Author: David Baum

evaluationserver/config.ru

@@ -1,4 +1,11 @@
 # This file is used by Rack-based servers to start the application.
 
-require ::File.expand_path('../config/environment',  __FILE__)
-run Rails.application
+require ::File.expand_path('../config/environment', __FILE__)
+
+if ENV['RAILS_RELATIVE_URL_ROOT']
+  map ENV['RAILS_RELATIVE_URL_ROOT'] do
+    run Rails.application
+  end
+else
+  run Rails.application
+end